Hi,
Try the following.
If you don't already have one, use another PC to create a Windows 7 Rescue CD. Download the relevant ISO from the links below - if you're not sure, your notebook is listed as coming with a 64bit installation..
You should use an application such as ImgBurn ( Note: you may want to de-select the additional software options during the installation of ImgBurn ) to burn the ISO to a CD - a guide on using ImgBurn to write an ISO to a disc is Here.
When created, tap away at the esc key as soon as you start the notebook launch the Start-up Menu and then insert the Rescue CD. Select Boot options ( usually f9 ), use the arrow keys to select the CD/DVD drive and hit enter. You may also get a prompt to 'Press any key to continue' - do this if asked.
Select the 'Repair your Computer' option and follow Option 2 in the guide on the link below to run Start-up Repair – you may need to run this 2 or 3 times.
http://www.sevenforums.com/tutorials/668-system-recovery-options.html
If the above fails to help, make a note of any error messages you may get during the procedure and include them with your next post.
Regards,
DP-K