My hard drive space is suddenly decreasing rapidly (30MB every few seconds), and I don't know what's causing it. It was 14 GB a couple of days ago. I've restarted my computer, and I've deleted some data, so it's just under 1 GB now (it got to a critical point earlier where it was at 96 KB).
My firewall was also oddly deactivated when I restarted my computer, but I've reactivated it now. I'm running a virus scan with AVG at the moment, but I have no idea what this could be. Could anyone help with this? Are there any well-known viruses or other nuisances that have this calling card?