aight go to start - run

type 'msconfig' into that and hit ok then go to services tab

there will be a lil check box at the bottom of your screen that says hide all windows or microsoft services click that. Then select the disable all button.

Then reboot and see if that fixes it. If it doesnt fix it go through that same process and then hit the enable all button to put it back the way it was before.

If it doesnt work come back and I will tell you another thing that might be wrong with it.