I am using avast internet security 7 [updated]. When i scan my whole computer, avast shows no virus found but when i open some old setups, avast detected "win32:kukacka" and avast delete my all setups[.exe files] saying these files are infected with "win32:kukacka". It always happens when i open any .exe file from same folder. I run full scan with avast but this problem does not solved. Please Help.