This is one I think is in the forum sticky. "Where is my hard drive space?" is a common question so use the tool noted in the discussion I linked to.
Yesterday, I remember my drive C still have 28 GB free disk space. But then a while ago today, I was startled when a notification pop out saying I am running out of disk space, and thought what the heck. I checked to see drive C on My Computer and I saw it only has 100mb free. I restarted my computer and see the space return back to 28gb free. But then it gradually decreases again as time went on until it gets 0 space free. I scanned my computer in safe mode and found no virus. I already did system restore (2 days back) but still it didn't repair the problem. Help! I don't know any more solution to this. It's my first time to experience this kind of problem.
My OS is Windows 7 Ultimate.