dont worry
most files can still be recovered if they are not overwritten
you need to boot from a second harddrive and use your main harddrive as the secondary master
you should borrow a friends large drive because you want to rescue everything you can
you must get this program
http://www.ontrack.com/easyrecoveryprofessional/
this program is a must have
dont use your harddrive or you will write over more files
install this program on the new harddrive and search your lost harddrive for erased files
after 20 mins
you will get a message with thousands of files
i would just select all and copy to the new drive
at this point nothing was saved and the files displayed are the ones that will be able to copy to your new drive
this will save all files to the new drive for safe keeping
i had a super corrupt harddrive and this program deciphered and saved hundreds of files including a complete office 2000 backup
please post your findings here
i hope it helps
cheers
egghead
after youve saved your mp3's etc...
you can safely copy the files back to your original harddrive without overwriting anything
btw
it sounds like kazaa haters have made good use of the xp bug mentioned in the other posts and deleted a very common folder for kazaa users
update to sp1 or get the fix from the link above
its only 30k
check for viruses
http://housecall.antivirus.com/housecall/start_pcc.asp
free online scanner
i use it whenever xp slows or acts strange