I have an HP Touchsmart 600 that had a hard drive failure. I replaced the hard drive, but due to the restore partition being on the fail hard drive, I had to purchase a new copy of Win 7 Pro. Upon installing Win 7 Pro, it went on fine, all updates went on, and computer operates perfectly for a few days. After a couple days, and a subsequent startup from being powered down, the operating system is no where to be found, and the POST keeps recycling. After reinstalling the new version of Win 7 Pro again, it is noted that the Windows.Old folder exists, which is the previous version of the Win 7 installation. This has happened multiple times, and I have no clue as to why it is happening. Any help would be greatly appreciated. Thanks!