AVG free reports "Virus detected while opening file C:windowssystem32avpu32.dll. TROJAN HORSE BACKDOOR.GENERIC.NIL. I have Windows XP sp2.
Regular virus scans miss it but this message comes up when I start an application. Not always the same application and not every time. I cannot see the file with My Computer. Show hidden files is checked. Hide protected operating system files is not checked. Cannot see the file from command line even in safe mode. My virus definition files are up to date.
Sure would appreciate some help.