New
#11
If it came with win7 preinstalled and preactivated, with a rainbow colored COA sticker at the back or below the battery, its OEM. Such computers are preloaded with an OEM specific recovery manager (Different OEMs have different names for it- HP calls it recovery manager, Dell has datasafe and so on). When you run this tool, it lets you make a recovery disk. If you boot from this disk and follow instructions, you can return the machine to the factory default state.