New
#11
Does it read like xxxxx-OEM-xxxxxxx-xxxxx. Then it is not. Does it say Windows is activated above that in Control Panel>All Control Panel Items> System. Then you still have the OEM activation intact.
Since you cannot read the COA key on the sticker, your only option if you want to do a clean install is to backup your OEM activation from your current OEM install and restore it after a clean install or use the OEM Reinstall disk which self-activates.
Please explore ways and means of backing up and saving your OEM activation before you or your friends muck up your system any further.