Depending on the PC, some come with a restore partition already on disk. If that is the case, probably the best is to clone the disk using disk cloning software and use the restore/recovery partition to reset the operating system to its original state. As Cathooloo noted, you can't really only do a partial restore. Some disk manufacturers provide disk cloning software for the purchasers of their disks to use for just this type of situation. The software and details of which products they apply to can usually be found at the disk manufacturer's web site.
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