[Help Please] Unmountable Boot Volume Issue + Other Problems

Hello, I would appreciate any help you could offer me on my tech issues concerning my desktop computer.

I have a Dell System DV501
Bios Version: A04

Anyway, getting the BSOD is not new for me. Many, many, many times in the past, I have been able to fix it with with the powers of Google and random clacking of keys.

However this time, whenever I try and boot from my Windows XP CD, it doesn't work. A green light blinks for a while, the CD spins around for a while and ultimately, I end up with a "Selected boot device not available." The CDs do work. I have tested them on another laptop.

When I think back, Earlier I tried to watch something on a CD, that CD didn't work either (back from when this computer was still functioning properly).

I have tried to create a bootable USB drive via "WinToFlash" but that has not worked out well either.

So I am just wondering, do any of you have any tips or ideas that I can try out?

Thank you for any help you can offer me and I know that this question is REALLY ridiculously long but I wanted to give you as much info and content possible. :]