Try booting in "Safe Mode", It will either be F8 or F5 to select it when your laptop 1st starts up. Look at the bottom of the screen it should say, DEL to enter bios, F5 for safe mode, F8 network boot or something along those lines. This will allow it to start with the minimal amount of drivers.
Alternatively insert your copy of windows, and try again. if it doesnt start windows from the disc, enter bios, and change the boot sequence to boot from the disk drive 1st instead of the hard drive (HDD)
Slippery Steve, November 2008