How do I remove a computer virus?
Windows 7 More
If your computer is infected with a virus, you'll want to remove it as quickly as possible. A fast way to check for viruses is to use an online scanner, such as the Microsoft Safety Scanner. The scanner is a free online service that helps you identify and remove viruses, clean up your hard disk, and generally improve your computer's performance.
If you're not sure whether your computer has a virus, see How can I tell if my computer has a virus? to check for some telltale signs. To try a different online scanner, follow the links to other companies that provide them on the Windows Security software providers webpage.
If you can connect to the Internet
If you can reach a website using your web browser, run an online scan.
To run the Microsoft Safety Scanner
Go to the Microsoft Safety Scanner webpage to download the scanner.
Click Download Now, and then follow the instructions on the screen.