I've noticed that my free hard disc space is constantly decreasing...

Task manager showed some unusual processes: svchost.exe

So I scanned the disc.....nothing found. I've cleaned the registry errors, temp files and so on with Ccleaner.

There are no more svchost.exe processes going on, and the space on the disc stopped decreasing, BUT, cpu usage jumps up and down like a maniac, and RAM is at 1.4GB with like.... only firefox and media player opened. So my computer is very slow now and I have no idea what's going on.

I use Vista, and I have 2GB RAM.

PLS HELP!