pkguard32.exe is a worm W32.Guapim. pkguard32.exe spreads through Instant Messenger programs and via open network shares. pkguard32.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\pkguard32.exe Adds the value: "PK Guard" = "%System%\pkguard32.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill pkguard32.exe process and remove pkguard32.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.