taskhost.exe high usage

[Orcvader]

So I noticed while playing StarCraft 2 with Skype, my CPU usage was at 100%, which was really abnormal. I checked Task Manager and noticed it was taskhost.exe hogging it all up. But the exe file was in the roaming folder, so I used Process Manager and saw it was connected to a "ypool.net", which Google showed was linked to CPU bitcoin mining. I scanned and deleted it, as well as the startup entry and it seems to be fine now. But I have no idea how I was infected! Apparantly it was created on the 08/08/13, with the taskhost.dll only created today (and started the whole high CPU usage). The only thing I've been doing is SC2 + Skype, so I have no idea how I was infected . Can you get infected via one of these two programs?

EDIT: And two friends I play with also got infected as well... how odd...

 

[Orcvader]

Yes, the 64 bit version just for Minecraft (and doesn't appear as a plugin within Firefox/Chrome). I still am quite confused how me and my friends got infected and seeing the high CPU usage at the same time. Everything is up to date as far as I'm aware. I haven't installed or ran new programs as well, so I have no idea how it suddenly was there.