I am losing disk space severly, and not even downloading!!!
I sometimes lose up to 3 GB's a day. this is a HUGE problem...and I need
a solution PLEASE!!!

System restore may be the reason for the loss of your disk space.
After the space allocation for restore is used up restore points will be deleted by Vista. If restore is the cause of your space loss then you should see the disk space loss level off.

so if it's restore, the space will come back?

Please post some more information on the drive. What kind is it? Storage size?

Obviously you should run some scans on the drive. Schedule a chkdsk to run on boot

From the command prompt

chkdsk /r /f

/r will look for bad sectors on the drive

/f will fix errors on the drive