Look in Task Manager for something suspicious.

There are viruses that write huge files to consume space.
Scan your computer with several online virus programs.

http://www.google.com/search?hl=en&q...anners+&aqi=g2

"Oliver Costich" <oc@5cats.net> wrote in message
news:fqs545t8fed29opnd34n0q1uall2onqv1s@4ax.com...
> Severl weeks ago, I got a warning that there was no more space on C:,
> my system partition. Properties showed 0 free space. I tracked down
> the problem to a file named mnc82DB.tmp, which was about 50GB. It was
> in the folder users\owner\appdata\local\temp. I have no idea where it
> came from and Google has no entries if I search on that file name.
> Trying to delete it fails, saying that it is open in another program.
> Rebooting and then deleting it fixes it....
>
> ...Temporarily. Today it came back. Same issues. It's very annoying
> sice if I try to print something I will lose if I reboot, it won't do
> it (0 free space). Another weirdness is that if I try to type
> something into the Firefox Goggle engine, the letters are entered in
> reverse order.
>
> Anyone have any idea what in the world this is? The OS is Vista
> Business x64 SP3.