Botzor.exe is a worm W32.Zotob.A. Botzor.exe tries to terminate antiviral programs installed on a user computer. Botzor.exe spreads using the vulnerability in Microsoft Windows Plug and Play Service (Microsoft Security Bulletin MS05-039). Related files: %System%\botzor.exe Adds the value: "WINDOWS SYSTEM" = "botzor.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill botzor.exe process and remove botzor.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.