Help My HD is shrinking!

[afterglow]

I don't know what caused it but this is the case. My browser was hijacked by a spyware callled gocybersearch and i installed a spyware removal to get rid of that. It was supposedly deleted already as it was detected by my spyware removal but when i re-started my computer, the spysearch site still occupied half of my default browser. I went to the registry and deleted it again but it still propagates. I used another spyware removal but the result was the same.

Now come another problem, my hd is shrinking. It has 20 Gig of storage and only 8 gig is being used which means there's more space but when i installed the spyware removals, they've shrinked my HD to 0. I kept on deleting files and i'm seeing more storage but after a few minutes, it would again shrink back to 0. I uninstalled both the spyware removals because i thought they're causing this but then they didn't helped. My HD is still shrinking to 0. I need help now to fix this problem. Anyone? I was wondering if i'm infected by a more vicious virus.

Help!