Ok the title is a little tricky. I have an OS installed (Vista). I was trying to upgrade to Windows 7 but the upgrade would not install. However, I am sure that if I format the HD then install their wont be any problems.

So here is the problem, When I boot up the PC it keeps trying to boot into Win 7 which is not on the computer at all. I have to always key down to prompt it to boot into Vista.

How do I remove the Win 7 from the start up? I Googled it and seen some things but most of the instructions were really clear.

Second if I do decide I want to try and get this windows installed without formatting how can I do that?

It sounds as if you have installed the boot sector of Windows 7 which I have never come across before. This has then created an entry in the Boot Manager.

Download and install this free software which you can use to remove the entry.

http://neosmart.net/dl.php?id=1

Scroll to the bottom of the page for the Download button.

Then you can download this free software to make a boot disc which you can then use to create a partition on the disk for installing Windows 7. This will then recreate an entry for Windows 7 in the Boot Manager that will give you a dual boot set up.

http://sourceforge.net/projects/gparted/files/gparted/gparted-0.7.0/