hey magic9669 I joined just to give you this answer!
I have the same drive and I screwed it up by doing one of two things.
Not 100% which was the culprit but I know how to fix it now regardless.
First I installed the new daemon tools 4.0 and it comes with spyware or ahem toolbar. and it may say it is not placing stuff when you don't check that toolbar box but it is regardless. trust that.
Two. I used yahoo's spyware remover and it picked up all the bad crud that was hidden and attached to a lot of my programs. among some were some keyloggers like redhand and other such malicious software. but and anyhow to make a long story short I just hit delete to get rid of them and didn't worry about that little warning that it say about if you delete these some of your software might not work. well guess what. it was right. my cd's dissappeared and my MS IE no longer worked. yahoo would come up though and so would other browsers. sooo
I found that by using this tweak program WinXP manager and going to the first tab and then repair section and hitting the repair CD/DVD button it fixed it all on the next reboot.
so you don't have to reinstall or go the painfull route of deciding what your gonna lose if you do reformat. just get the tweak program. it also has a utility in it that allows you to repair any windows XP file. It will do a full check on the entire list of the original installed files and find any that are corrupted and not the original ones and repair them.
and if your using p2p and have raised your half open connections just use this file called evid4266patch and it will set your half open connection for you too.
hope this helps cuz it sure helped me. l8r bro
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