Hey all, First time poster here. As the title mentions, I've just picked up my 2.4GHz Mid-2010 MacBook second hand. I'm a heavy PC user and this thing is not by any means the harbinger of my eventual transition to Apple products, I just got a sweet deal on it and the eventual goal is to bootcamp Windows onto it anyway. Now, the previous owner was not by any means a "power user" or "enthusiast" or whatever you want to call it, and as such the MB was pretty much untouched to the point where it still had a password on the main user account. So again as the title implies I'm looking to clean this thing up a bit. I'm already in the process of deleting the old user account (complete with home folder etc) and I'm going to use disk utility to erase free space. Should I still be opting for a complete reformat, though? If so, the only trouble is that I lack the original installation disk, which I think had Snow Leopard on it anyway. Also, if I do manage to get my hands on the original installation disk, will I have any trouble getting the OS back up to Lion? If OS upgrades are tied to Apple IDs the same way iTunes Store content is, I obviously wouldn't be able to redownload Lion under the previous owner's credentials... I'd appreciate any and all advice.