Hi there, This is my first post on this site, hopefully you will be able to help me out. Yesterday I was hit with a fairly bad trojan, thankfully I was able to resolve the issue but it's left my computer feeling worst for weather. I've decided I want to go back to Windows XP rather than VISTA as it runs much nicer but when I went to install the OS I got the following error message: "Setup did not find any hard disk drives installed on your computer." After doing a bit of research, it's apparently something to do with the BIOS setup, so I went into the BIOS setup to check the hard drive and it said "Not Installed"... This would usually mean that I have had some sort of a hardware failure, but as I'm currently speaking from the OS on the not installed hard drive there seems to be something wrong. I have done a chkdsk which never came up with any errors and the device manager in the control panel is also coming up with no errors. I can save/edit/load programs without any issues at all. I've added a picture link but apparently I can't do it due to the low post count. You can see what I mean about the BIOS. I've asked all my computer wizz kid friends, but non of us seem to be able to work it out. I've checked the connecting wires as well. Looking for some advice! Thanks, Scott.