Here's a longer explanation... I had WinXP already installed on my computer with no partition except for that one. I made a 20 GB unallocated partition using the EaseUS program, then using a FreeDOS (FreeDOS is an MS-DOS compatible OS) disk I made, I installed it onto the unallocated space. When it had finished, I restarted my computer surprised to find it say, "Error, corrupted operating system" I then came up with the idea of deleting the DOS partition and installing WinXP a second time onto the partition. I did that, booted into the new XP, and from there I could view all my files on the other partition except the ones which are locked by my old user. I don't want to just access them I want to actually boot into that partition because I know it's still there. It just won't come up on the startup screen when it asks you which partition do you want to boot into. Because I have programs that I bought and just opening them from the second partition, won't open them in the full paid-for version.
How can I fix my default partition and boot into it? What can I do to fix the 1st/default partition and make it viewable in the partition select screen when you first turn on your computer?