Game speed is sluggish despite settings

[ImDuncanOnYou]

The game has worked before and one time it just started playing in slow motion even though the settings for game speed are normal. It's not jerky at all, but just really slow. I've tried reinstalling the game, but to no avail. Any help appreciated.

My specs are here: http://img96.imageshack.us/img96/5967/specs5ht.gif