Hello... I just got this PC Windows 7 OptiPlex 990 SFF and I'm curious since I can see a hidden recovery partition within the hard drive . I'm curious how does one start this process to reinstall back to factory setting? And is recovery partition all that needed to reinstall back to factory setting? Also, what do you recommend one should do if one ever needs to reinstall the operating system on a new hard drive? The PC didn't come with a Windows disc, just the recovery partition. Thank you