Thats a scare-ware attempt to get you to click on a malicious link, “Microsoft Warning Alert” fake error messages.
Which ever browser your on
Open Task Manager by right-clicking the taskbar and then clicking Start Task Manager. Alternatively to start the Windows Task Manager, you can press Ctrl+Alt+Del and click on Task Manager or simply press on Ctrl+Shift+Esc.
Locate your browser and right click and select end task.

Adblock is a good tool with this.

We need to reset your browsers.

Instructions on how to backup your Favourites/Bookmarks and other data can be found below.

Backup Internet Explorer Favourites
Backup Firefox Bookmarks
Backup Chrome Bookmarks

Proceed with the reset once done.

Internet Explorer: How to reset Internet Explorer settings
Firefox:Reset Firefox
Chrome: Chrome - Reset browser settings


Let's see if there are any startup items we can disable to improve performance.

Go here to download HJT
  • Save HJTsetup.exe to your desktop.
  • Doubleclick on the HJTsetup.exe icon on your desktop.
  • By default it will install to C:\Program Files\Hijack This.
  • Continue to click Next in the setup dialogue boxes until you get to the Select Addition Tasks dialogue.
  • Put a check by Create a desktop icon then click Next again.
  • Continue to follow the rest of the prompts from there.
  • At the final dialogue box click Finish and it will launch Hijack This.
  • Click on the Do a system scan and save a logfile button. It will scan and the log should open in notepad.
  • Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log.