I keep getting a virus alert when I press CTRL+ALT+DEL to access the Windows task manager. Avast moves
taskmgr.exe to the vault.
It says taskmgr.exe is infected with Win32:Evo-gen [susp]. It also mentions process winlogon.exe.
Yesterday I thought I'd solved the problem, and Avast didn't seem to detect anything when analysing winlogon.exe and taskmgr.exe, or when performing a full system scan.
But now it's back. I press CTRL+ALT+DEL and the alert pops up, sending taskmgr.exe to the vault again.
I also ran a scan with Malwarebytes, but nothing showed up.
I've googled a lot, and I found people with winlogon and evo-gen [susp] problems, but nothing related with taskmgr. And Avast says winlogon.exe is clean.
I'm clueless.
(I'm on Win XP SP3)
Screenshot (in spanish)