dismount volume error

Alright, here is the problem. I got an older desktop up in my room, it currently has xp on it, no partitions. I am wanting to reformat for two reasons, one xp is not worth using on this cpu, and two I had a trojan a while back. I believe that the trojan is no longer on my cpu.
Anyway, I go to c prompt, and tell my cpu to format c:, and it asks if I really want to do it (Y/N). I hit Y, and then it tells me that there is a volume being used, would I like to force a dismount of this volume (Y/N)? Y, and it tells me that it is unable to do so. Suggestions?

Taldarus

PS sorry if this has been discussed, but I didnt see any threads that covered this.

 

heh..I just replied to a thread similar to yours here
http://forums.majorgeeks.com/showthread.php?p=518825#post518825

never mind that it's win2000 , it's the same process.