Joel: I've haven't got any backup, so I'll have to reinstall Windows if we can't solve this problem :x I'm using AVG antivirus Free Version.
David: On startup (msconig) I have: AVG Anitvirus, Sygate Firewall, Winpetrol, ccleaner, ctfmon, Comodo time machine (which I've tried but doesnt work), Logitech LCD screen (for Z-10 speakers). No matter if I disable one, two, three or all, they are still starting up again...
Carver: I tried typed exactly what you suggested but I just get message saying: "Can't open volume for direct access" or something like that (I translated the text into English from my language).
It seems like that I can't do any changes on the computer at all (settings, deleting, saving). When I try to do the changes it just comes back to where it was after I reboot or I get a message that I can't do it because of insufficient space.