[HELP]Installing Seven Ultimate

Alright well I got a CD from a friend that has Windows 7 ultimate on it. (build 7600 32 bit) But I was stupid and installed the Starter version rather than Ultimate. Now im stuck. I tried to reinstall and click on where it says "Ultimate" but I cant. I get to where it says "Upgrade" or "Custom" and I select custom. Then it doesnt give me a choice of clicking on Ultimate. Instead it just goes into the installation process and then says
that the installation is not successful because it is missing files or something. I am really stuck here and would love some help. I cannot stand windows 7 starter and would like to upgrade.
PLEASE HELP?

Thanks in advance,

Ok well I have tried that. So do I just insert the CD containing the OS and then go to custom? Sorry Im a bit of a noob when it comes to OS's... I can program all day but when it comes to this stuff I have no idea what to do T.T

And I know I trust this guy. I dont think it has anything wrong with it, I jus dont know how to use it. And im not about to spend 200 on a OS when i can jus go back to Vista...

Read this tutorial:
Custom Install Windows 7

It might help.

ok Well I did what you guys said and I followed the TuT. But Igot to the part where it says "expanding files" and it gets stuck. Then an error message pops up that says "Windows cannot install required files"... What do I do? I really hate seven starter... I should have just clicked ultimate...

Ok well I still havnt figured out how to fix this. Should I try another version? If so does anyone have a working Windows seven Ultimate? I dont care what build really, as long as its newer than 7077

@docbrown
Thank you I wasnt sure how to word that :P Ima try that now.

@tew
Thanks for all of your help. Im not gonna reburn this ISO tho, im going to try to find a new one. (: