I'm running windows xp pro and i think it's reporting the wrong amount of free disk space on my system parition. When i check the folders individually it tells me that i'm using 7gb, but when i check the drive as a whole it says 15gb are being used. I tried running the xp scandisk, but when it gets to phase 2, it stops and says the disk could not be checked. any ideas what i can do to fix this short of reinstalling.

Also, i have two copies of xp and i can't remember which copy was installed on which puter. is there any way to find out what cd key i used on what computer?