Be careful. I was running Norton Antivirus 2007 - but it had a routine that was 'leaking memory' (I only know this as my hard drive was constantly rattling & when I looked at processes running, there was a routine using nearly all my memory. Googled the name of the routine & found out it was a known bug).

Anyway scrapped Norton & got a free anti virus/spyware prog. I have all my downloaded content from Renderosity & Daz on a second external hard drive. The second hard drive was switched on & when I run the spyware program it saw all my Daz files (which are .exe files) as threats and now they are unusable. Luckily I have everything backed up on CD. Partly my own fault probably as I was busy at the time & probably OKed before looking properly.