You had a blue screen of death, take a look at
BSOD's on my signature, and post a log here so that I can take a look.
Also, do you have a Windows XP Setup CD? There is another version of chkdsk you can use from there. Insert the CD at bootup, and it will start loading the setup files. When prompted press R to enter the recovery console. At the recovery console, use the command
chkdsk /r
If not, I'll see if I can find you something else.