I had Windows Vista Ultimate 64 bit on my computer and bought Windows 7 Home Premium 64 bit. I backed up all my documents, files, etc and booted from the install CD. I used the Windows 7 Setup wizard to format my C drive and do a clean install of Windows 7. This went through without a hitch. However, whenever I boot up my PC, it shows the following error:
'A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. If you have a Windows installation disc insert the disk and restart your computer. Click "repair your computer" and then choose a recovery tool. Otherwise, to start Windows so you can investigate further, press the ENTER key and display the boot menu, press F8 for Advanced Boot Options and select last Known Good. If you understand why the digital signature cannot be verified and want to start Windows without this file, temporarily disable driver signature enforcement.
File: \windows\system32\winload exe
Info: Windows cannot verify the digital signature for this file'
When I press enter to continue, I get taken to the "Select OS" screen and the only option listed is "Microsoft Windows Vista".
I've noticed that when I leave the Windows 7 disc in the DVD-ROM drive, it boots up with no issues at all. When I take the disc out and boot up, I get the error above. I've checked the file winload.exe and it is digitally signed.