Many manufacturers include a hidden recovery partition on the hard drive. Depending on manufacturer you have to click a certain key immediately upon starting the computer. Sometimes it's the F2 key (top of keyboard) or F11 or something else. You may also have something in the Start menu > Programs pertaining to the Advent. You might see Advent Recovery Manager, or Advent Diagnostics, or something else that would lead to accessing the recovery partition. Specific information should be in the user manual. You may have also been given the option when you originally set up the laptop to create a set of recovery discs. Make sure the BIOS is set to boot from the CD/DVD drive as first choice, insert Disc 1, and let the computer boot to that disc. follow the prompts to restore the machine to factory specs.
If you don't have access to a hidden recovery partition and if there's nothing in the Start menu, and if you didn't create the recovery discs, you might have to buy recovery media separately if you don't want to do a complete clean reinstall of the operating system. Advent Quantum Q200 Restore and Advent Quantum Q200 Windows 7 Recovery Partition Re-Image DVDs.
EDIT: I'm going to tie one of seavixen's hands behind his back. He types too fast!!