Hi Codfish,
thanks for the info. I checked through the Asus site/FAQ/Forum without finding any answers..

Apart from suggesting you make sure you have the very latest bios. I know you recently flashed the bios but didn't say which version you were using?
The only thing I can suggest is make sure you have the very latest drivers for everything and try a few different drivers for your graphics set-up as some work better than others. If you look here:
http://downloads.guru3d.com/Videocar...Vista_c32.html
This is a whole page full of recent Nvidia drivers for vista. Try the 169.44 first as I remember them being pretty good.
The last thing I want to mention is if I remember correctly you did say that if you took the 4th stick of RAM out, the machine ran fine. I have heard in forums where mobos not liking all the slots being used maybe yours is one of them?
So with RAM being so VERY cheap at the moment have you considered buying 2 sticks of 1GB instead of having the
4@512? You never know you may be able to run the 2 sticks of 1GB and 2 sticks of 512.... With them being different your mobo might just work.. You know how weird these machines can be..
