Well i had that happen once to me, I thought that something went horribly wrong when i turned on my laptop & it got stuck at the logo screen.
Here is a small fix that just might work for you. 1st unplug your laptop power cord & remove the battery from the bottom.
Then take a small screw driver and remove the cover that houses your CMOS battery & take it out( for about 5 minutes)
The CMOS battery looks like a watch battery (about the size of a dime.)
Then put back in the CMOS battery and bootup your laptop. It should be able to load windows just fine.
Hope that helps...