Anyone else see anything wrong with this screenshot?

Yeah, weird, huh? For some reason it was reporting my disk usage as a NEGATIVE number. I've never seen that before. I found it because ZoneMinder had stopped recording for some reason - it thought I was out of hard disk space when in actuality there's very little drive used. A quick reboot fixed the problem. Lucky for me there's nothing important on this box - it's simply for zoneminder and watching Hulu or streaming my MythTV recordings to my bedroom. I think this happened after our power spike and outage the other day. This particular PC isn't on a UPS.