...that you have a prior version of Windows on your hard drive. But if you put XP or Vista in a partition, you can then install Windows 7 in a separate partition on the same PC. Remember that you'll need to get the drivers for the new install.
Windows7 Upgrade so messed up nothing is working right. Can't even install updates.
Can I wipe the hard drive and then re-load or do I have to have info ( i.e. reg. #)from original OS lurking around somewhere in the system?