I'm looking for a good antivirus that provides real-time scanning of downloaded or opened files, just like the ones for Windows do - Norton, BitDefender, RAV, Panda, Micro Trend a.s.o. This is only as a preventive method for the Win workstations in my network... (better safe then sorry).
As far as I know, all I've heard about so far are antiviruses for mail servers or stuff like this. Some others have "client" side version but this only scans on demand, not real-time.
Any suggestions are welcome... I really need one as I ended up booting WinXP and manually deleting avserve2.exe (a.k.a Sasser worm) from the windows registry and system folder. I'm using MDK10.0 Community w/ Contrib, kernel 2.6.3, AMD K6 II+ @ 0.5Ghz (

) w/ 192MB Ram, GeForce 2 MX 400 w/ 64MB and a 60gig hdd.