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#11
As it's often difficult to reach the CMOS battery in a laptop (google your model to see) then I would make every effort to get the disk to boot. Make sure the disk in question is bootable in another PC just to be sure.
If all else fails I would boot the maker's HD Diagnostic extended CD scan to test the HD, then use the disk's Quick Wipe function to wipe the HD. Another option is free Partition Wizard CD which boots itself.
This will cause the Win7 DVD to boot itself so that you can Clean Reinstall - Factory OEM Windows 7 with the licensed version.