I've got a couple of machines that definitely recently had viruses and very likely still do.
I've run Norton AV, Radix RootKit remover, Sophos Rootkit remover, Spybot, Ad-Aware, CA Antivirus Plus, AVG, AntiVir, SysInternals Rootkit Revealer and none of them can find any more nasties on these machines.
I've even taken out the hard drives, stuck them in a USB drive casing and scanned them from another virus free machine. Still nothing.
The Windows "Show Hidden files/folders" setting however keeps turning itself on. You switch it off click OK and straight away it's back on again.
I've monitored the registry key for the setting with SysInternals RegMon and that revealed that the setting was being reset by explorer.exe as soon as I change it manually.
Like I said I'm fairly certain that there is still some sort of extra sneaky virus or root kit on these machines but I'm now investigating the remote possibility that the viruses are gone and something else is resetting the "Show hidden files" setting.
Any suggestions? I'd really like to avoid a reformat of these machines.