I used the disk clean function and thought I would be saving more space on the drive by checking the compress feature. Now when I boot up, after the Dell window the message shows up on a black screen, like a 'c' prompt screen HTGCM is compressed hit ctrl - alt - del to restart. When I do that just repeats the cycle. How do I get out of that and get the thing to boot up. I tried the boot up disc that the system creates for you and selected each of the options in turn down to the 'system image' one, because I don't have a system image of Windows 7 Ultimate. When I used the restore point, the result was "did not restore completely error# 0x800700b7". I have no original software cd's. Can anyone help?