Windows XP dead as a doornail?

Hello,

Maybe you guys can help me on this:

Windows will not boot up- the screen just turns off (light goes amber) after the Windows screen. F8 doesn't seem to work. I can go into the bios, but that's about it.

I tried it with two Linux live CDs I had kicking around, and they both worked, but it will not boot the Windows disc. (If that's even possible, I assumed that it was) I even tried it with somebody else's Windows disc, and that didn't work either.

I can access the Internet when Unbuntu Live is booted up (albeit, rather slowly of course). Ubuntu cannot mount the hard drive, however, and I couldn't figure out how to force it. I'll take a moment here to say that my Linux command line skills are pretty weak, so I couldn't get it to work via the terminal, even though Ubuntu told me what command to use. *embarrassed*

I had my PC hooked up to my tv via my video card when it first stopped working, and in that case, I also got a Windows screen about 'calibrating network connections' or something like that. This screen is not apparent now that it's hooked up to my monitor again.

The day before my PC stopped working, I had been trying to get rid of a virus or trojan (can't remember which) that my anti-virus kept flagging. Though that could just be a coincidence.

So anyway, any advice? I can't even get safe mode to work, so as a slightly geeky computer user, I'm out of ideas.