How to Remove Search.microcosmtab.com

What Is Search.microcosmtab.com?

An unwanted browser extension called Microcosm – New Tab may get installed on your computer together with some free program downloaded from the Internet, change your New Tab page and set your default search engine to https://search.microcosmtab.com/ which will redirects you to search results on other search engines. Usually uninstalling the unwanted extension and changing browser settings to something else is not hard, however Search.microcosmtab.com is marked as “enforced by your administrator” and cannot be removed just like that. That is because Search.microcosmtab.com is getting written into Windows Group Policy as Chrome’s default search engine. Group Policy is primarily used by admins on corporate networks to force-install or forbid certain software and settings. You may follow this step-by-step removal guide to reset Group Policy and remove Search.microcosmtab.com from your browser.

How to Remove Search.microcosmtab.com

Before going after the browser hijacker itself you need to delete Group Policy files.
Note: this solution is for home computers only. If your computer at work is infected, contact IT personnel instead.

1. Open %WINDIR%\System32\GroupPolicy folder (just copy that path and paste into the address bar of Windows Explorer). Delete the contents of that folder.
2. Next open %WINDIR%\System32\GroupPolicyUsers and delete the contents.
3. Restart the computer.

Alternatively, you can open Command Prompt (right-click and select “Run as Administrator”) and enter following commands one by one:
rd /S /Q “%WinDir%\System32\GroupPolicyUsers”
rd /S /Q “%WinDir%\System32\GroupPolicy”
gpupdate /force

After that you may use our instructions to remove Microcosm extension and Search.microcosmtab.com manually, and/or run an anti-malware program to get rid of this browser hijacker and make sure no other malware and adware is present on your PC. SpyHunter is a powerful anti-malware solution that protects you against malware, spyware, ransomware and other types of Internet threats. SpyHunter is available for Windows and macOS devices.

Download SpyHunter

Other good anti-malware software:
Norton (Windows, macOS, iOS, Android) The link may not work correctly if your country is currently under sanctions.
Norton (Windows, macOS, iOS, Android) The link may not work correctly if your country is currently under sanctions.

Malwarebytes (Windows)

You can also try to remove Search.microcosmtab.com by hand using the following instructions.

Remove Search.microcosmtab.com From Browsers:

To get rid of Search.microcosmtab.com, either reset browser settings or remove Microcosm – New Tab (ID: nagnmfhgkjkplbhplkbicmpkfopmnefp for Chrome) and any suspicious extensions from browsers and set new tab page and default search provider.

Reset Google Chrome Settings:

Note: This will disable your extensions and themes, clear cookies and site data, as well as change content settings, start page, new tab page and search engine to default.

1. Open a new tab.
2. Copy and paste into the address bar: chrome://settings/resetProfileSettings
3. Press Enter.
4. In the dialog box click Reset.

Alternative Way to Get Rid of Search.microcosmtab.com in Google Chrome:

1. Click on three dots menu button at the top right corner of the window.
2. Select More tools ⇒ Extensions.
3. To remove an extension, click on a trashcan to the right of it.
4. Click Remove in the dialog box.
5. Right-click the address bar and select Edit search engines….
6. Click on three dots button next to the search provider you want and select Make default.
7. Click on three dots button next to hijacker search engine and select Remove from list.
8. Click on back arrow at the top of the page (near Manage search engines).
9. Under On startup section select Open the New Tab page.
10. Scroll to the top. Under Appearance section enable Show Home button setting.
11. Clear the textfield of the existing address. Put the one you want or select New Tab page.
12. Close Settings tab.

Note: If you cannot access the Extensions page, click on the top left corner of Chrome window and open Task Manager. End processes for any unfamiliar extensions that are running. Then go to the Extensions page and delete these extensions.
Alternatively, go to %LocalAppData%\Google\Chrome\User Data\Default\Extensions (just copy that path and paste into the address bar of Windows Explorer/File Explorer). Delete all folders within (that will remove all your installed extensions) or search the Internet for the folders’ names to figure out which extension compares to which folder and delete suspicious ones.

Reset Mozilla Firefox Settings:

Note: Your extensions and themes, among other things, will get deleted.

1. Click on menu button .
2. Click on help button and select Troubleshooting Information.
3. Click Refresh Firefox… in the top-right corner.
4. In the dialog box click Refresh Firefox.

Alternative Way to Get Rid of Search.microcosmtab.com in Mozilla Firefox:

1. Click on menu button and select Add-ons.
2. Go to Extensions tab.
3. To uninstall an add-on, click on Remove button next to it.

Note: If the extension is impossible to delete, click on => => Restart with Add-ons Disabled…. In dialog boxes click Restart => Start in Safe Mode. Repeat steps 1-3. Restart Firefox in normal mode after you are finished.

4. Click on the search icon in the search bar and click Change Search Settings.
5. Select search engine you want from the drop-down menu.
6. Highlight the hijacker search engine in the table below and click Remove.
7. Go to General tab.
8. Under Startup section click Restore to Default button.

Reset Internet Explorer Settings:

Note: This will remove most of your saved browser data, including extensions, passwords and the majority of browser settings.

1. Click Tools button in the top-right corner.
2. Select Internet options.
3. Go to Advanced tab.
4. Click Reset… button.
5. Put checkmark in Delete personal settings checkbox.
6. Click Reset.

Alternative Way to Get Rid of Search.microcosmtab.com in Internet Explorer:

1. Click Tools button in the top-right corner.
2. Select Manage add-ons.
3. In the drop-down menu under Show: select All add-ons.
4. To delete an add-on, double-click it; in the new window click Remove.
5. Go to Search Providers tab.
6. Right-click the search engine you want and click Set as default.
7. Right-click the hijacker search engine and click Remove.
8. Click Close.
9. Click Tools button .
10. Select Internet options.
11. Under Home page section click Use new tab or enter the URL you want.
12. Click OK.

Reset Opera Settings:

Note: This will delete all saved data including bookmarks and passwords and return the browser to freshly installed state.

1. Exit Opera browser.
2. Open File Explorer.
3. Go to C:\Users\username\AppData\Roaming\Opera\Opera, where username is the name of your Windows account.
4. Find and delete Operapref.ini file.

Alternative Way to Get Rid of Search.microcosmtab.com in Opera:

1. Press Ctrl +Shift + E keys to open extensions manager.
2. To remove an add-on, click on the x button next to it.
3. Click OK when asked to confirm.
4. Click on the top-left corner, select Settings.
5. In the Search section select one of the search engines from the list.
6. In the On startup section select Open the start page.
7. Click OK.

Remove Search.microcosmtab.com From Programs and Features:

Go to Programs and Features, uninstall suspicious programs, programs you don’t remember installing, or programs you installed just before Search.microcosmtab.com appeared on your browser. When you are not sure if a program is safe, look for the answer on the Internet.

Windows XP:

1. Click Start.
2. In the Start menu select Settings => Control Panel.
3. Find and click Add or Remove Programs.
4. Click on the program.
5. Click Remove.

Windows Vista:

1. Click Start.
2. In the Start menu select Control Panel.
3. Find and click Uninstall a program.
4. Click on the program.
5. Click Uninstall.

Windows 7:

1. Click Start.
2. In the Start menu select Control Panel.
3. Find and select Programs and Features or Uninstall a program.
4. Click on the program.
5. Click Uninstall.

Windows 8 / Windows 8.1:

1. Press and hold Windows key and hit X key.
2. Select Programs and Features from the menu.
3. Click on the program.
4. Click Uninstall.

Windows 10:

1. Press and hold Windows key and hit X key.
2. Select Programs and Features from the menu.
3. Click on the program.
4. Click Uninstall.

How to Protect Your PC From Search.microcosmtab.com and Other Browser Hijackers:

• Get a powerful anti-malware software, capable of detecting and eliminating PUPs. Having several on-demand scanners would be a good idea too.
• Keep Windows firewall enabled or get a third-party one.
• Keep your OS, browsers and security utilities updated. Malware creators find new browser and OS vulnerabilities to exploit all the time. Software writers, in turn, release patches and updates to get rid of the known vulnerabilities and lesser the chance of malware penetration. Antivirus program’s signature databases get updated every day and even more often to include new virus signatures.
• Adjust your browsers’ settings to block pop-ups and to load plug-ins only when clicked.
• Download and use Adblock, Adblock Plus, uBlock or one of the similar trustworthy extensions for blocking third-party advertisements on web-sites.
• Don’t just click on any link you see while browsing the web. That applies particularly to links in comments, on forums, or in instant messengers. Pretty often these are spam links. Sometimes they are used for increasing the traffic to websites, but often enough they will land you on pages that will try to execute a malicious code and infect your computer. Links from your friends are suspect too: the person who shares a cute video might not know that the page contains threatening script.
• Don’t download software from unverified web-sites. You can easily download a trojan (malware that pretends to be a useful application); or some unwanted programs could get installed along with the app.
• When installing freeware or shareware, be sensible and don’t rush through the process. Choose Custom or Advanced installation mode, look for checkboxes that ask for your permission to install third-party apps and uncheck them, read End User License Agreement to make sure nothing else is going to get installed. You can make exceptions for the apps you know and trust, of course. If declining from installing unwanted programs is not possible, we advise you to cancel the installation completely.