Yes, a fresh install will wipe away all issues and you'll have no more if you follow these steps to get a perfect Clean Reinstall - Factory OEM Windows 7
then stick only with the tools and methods which work best for Windows 7 based on thousands we've helped with here. The steps are the same for retail.
It was not wise to involve your parents in criminal activity since pirating software is a crime. This will not only make up for it but end up with them having one of the better installs around.
Just to be sure you have the cleanest slate and clear the boot sector of illegal activation cracks, when you boot into the installer start by pressing Shift + F10 at the first installer screen to open a Command Line, then run Diskpart Clean Command
. Then close the Command Box, click Install Now, follow the illustrated steps in Clean Install Windows 7
to create and format your partitions, install Windows 7 to the first large partition (not counting the small boot partition created by installer).
Pay close attention to the Reinstall tutorial for how drivers are handled in Windows 7 as it is different than XP. The closer you follow those steps the more perfect your install will be - and stay.