Strange.

I got up from the PC [amazing, eh?], went to the washroom, grabbed another tea and came back to see a system warning that I was low on memory. Strange, was fine when I got up to leave. My first thought was virus, but I've done so many virus scans and I'm always 150% up to date on ALL virus scans AND definitions so to be sure I did some online Panda antivirus scan and one at antivirus.com. Nothing. Second thought - Spyware/Adware! But no, I'm even more up to date on Ad-aware's definitions, Spybot, CW-Shredder, Hijack This andSpyware Blaster. Nothing was yielded from any scan yet my system remains as so:


and


Any ideas??