Woohoo, there is A LOT of backgound tasks runnung on your system(about 50, I have 32 at the moment) . Check TaskManager(rightclick on taskbar -> select Task Manager) and try to shut down everything what you will be able to shut down. Also go to BIOS and enable HyperThreadnig there, it may help.
Run virusscanner, the best way is to run test "after restart" - testing starts before Windows finished booting(Avast! can do this,
www.avast.com)
And at last, I see you have a C-Media audio, I have newer version and I have some problems with it. Press SHIFT+N in LFS, it will cut all sound calculations. If you framerate will boost by this(frames grows always when you cut sound - less CPU load, so let us know how much did it helped), disable HW sound acceleration in DXDIAG(Start -> Run -> type DXDIAG).
The last thing what you can do is to lend some disk(if you dont want to format) and do clean install....