You can remove viruses using a free antivirus tool such as Avira Free Antivirus. If the virus scanner detects a virus or other type of malware, the suspicious file is moved to the quarantine where it can no longer do any harm. You’ll then be alerted so you can check the file and, if necessary, delete it. It’ll then be erased from your hard drive. It’s then always best to run another virus scan just to check that the malware hasn’t replicated itself.