recently acquired user on network has Ubuntu an workstation. Need to remove and replace with windows. Have tried using windows disk for XP, Win 7, will not open up. Goes to hit any button to start from CD, then Ubuntu starts. Have changed BIOS and taken hard drive completely out of boot, still boots. Moved to another computer as a slave, will not let me get and format that way either. To the point of just purchasing new drive and throwing this one ion trash. Any help?