Agreed that Microsoft probably couldn't care much less about pirated copies of 7. But, still....
If you have a recovery partition on the drive, that will be in a separate partition, so you can wipe the other partition (Which will have data, programs,...) and then reinstall the OS from the recovery partition to have a machine that is basically out-of-the-box when it was new.
Before spending money, check with the recovery software on the recovery partition. Some of them have data wiping options built in....
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