Got a nasty virus on my pc, unfortunately didn't catch the name. Had mcafee catch it,yet after it said it cleaned it,ran virus scan again and looked like an html screen popped up and pc shut down &rebooted,eventually couldn't even boot from safe mode. would blue screen, with error msg. Eventually could boot from bartpe and tried to run the virus scan plug ins on c drive but that too would shut down, blue screen while I was scanning. Decided to put in another hard drive and reinstall xp home operating system. This is an emachine t4165 1.6ghz 1gb ram 60gb maxtor 5400rpm ultra ata hard drive. It only came with 2 restore cd's which i notice are norton ghost version when installing. New harddrive is a seagate ST380011A 80gb 7200rpm ultra ata, works for a bit, then when installing windows update or running a virus scan on old drive which I installed as a slave drive, It will reboot into blue screen Unmountable boot volume. Tried 1 more seagate 40gb hard drive and get the same thing. ran chkdsk on the 2 new drives seem to be fine. Checked the cable seems to be fine. Tried the old hard drive as slave in another system the other day and it wont even show up. Notice i get the same thing now when I do it as a slave on this system too. Old hard drive seems to be dead now wont show up. I've done everything so far to try to get this system back up, reset bios to default, new hard drive, etc... What is confusing me is, this pc was fine until the moment the virus showed up, ran good no problems Yet now everything seems to be pointing to a hardware problem, most likely the main board. Is it possible for a virus to knock down the mainboard somehow. So far I have swapped out the video card, have a new power supply but haven't put it in yet. The fans are all running and I am not getting any parity errors. I know i have a crap version of XP and probably need a full version but I was getting blue screened even in a windows preinstalled environment which is booting from a cd drive, which leads me to believe its a hardware problem. By the way this pc is not on a network, so there's no way for the virus to have gotten on to anywhere else. I can reinstall Xp and leave it on allday but when I try to run any type of aplication for too long especially windows update it will reboot into the unmountable drive blue screen. I did reinstall my pc wireless card but thats about it, next step is always to go to windows update which will download and install a few patches, but usually wont install the enire first load of them, it errors on the last like 10 of them and eventually as i keep trying to install the xp updates it will reboot on me. Any Ideas whats going on? And do you think all the data is lost on my old drive? I did leave it plugged in for awhile with power on so it is possible the virus ate it, but I could see the data on it for about 2 weeks and it didnt seem to be writing much on it, I even managed to pull my documents off it onto 1 of the drives but now the drive won't even show up.