I have some sort of virus on my PC, which has affected my computer in the following ways; Google and other search engine links redirect me to random sites I cannot run Malwarebytes Anti-Malware or Spybot SD or any other anti-spyware for the most part. When I try to run them they will run once only to disappear a few seconds into the scan. When I try to run them again I get the following message, "Windows cannot access the specified device, path or file. You may not have the appropriate permissions to access them." (I am the administrator) A program called Windows Antivirus Pro appeared on my computer and was creating popups and changed my background image, however I think I got rid of it using a program called Stopzilla so this isn't as big an issue. I've tried running MBAM and Spybot in safe mode and I get the same error message. Spybot usually runs before startup but it fails then also. I am using windows xp home with service pack 3. Any help anybody can give would be greatly appreciated.