I had windows and 7 and umbuntu installed on my computer. Windows Vista came on it origiinally. I decided to upgrade to Windows 8 without the dual boot. I attempted to delete the partitions and upgrade to windows 8 unsuccessfully. At present, neither of those operation systems work. I contacted Acer and got the orginal software so I could begin the whole process again. When I attempt to boot from the vista software recovery disk, I get the message " the boot configuration for your pc is missing or contains errors". I think I need to do a reformatting process, but am not sure how since I cannot get a command prompt in vista, win 7 or win 8. What am I not doing right?