Over the past few weeks I have noticed that a particular instance of svchost.exe is taking up a large amount of memory, and increases in size over time. For example, upon booting my PC it sits at ...

I've run across this bastard twice today and nothing I do seems to stop it. I've done Combofix, rkill, an MBR check, Rootkit Revealer and GMER. The last two see the rootkit and immediately die: either ...