Vista - Vista repair installation not working

Hello,
I have a Hp Pavilion notebook with Vista Home Premium. The PC boots fine, but when I log in to the user account with the password the screen turns all white.
I also tried in safe mode and in safe mode as soon as I put in the password in the screen turns all black. It says "safe mode" in the corners and the top of the screen says:
"Microsoft® Windows® (Build 6001:Service Pack1)"
You can move the mouse pointer around but there is nothing to click on and the screen remains black.

I came across this great forum and I followed the instructions in the tutorials.

First I tried "How to Do a Startup Repair in Vista" and it said it was unsuccessful.

Next I followed the directions from "How to Do a System Restore in Vista"
and it said " no restore point have been created on this computer's system disk"

and now I am trying "How To Perform a Repair Installation For Vista"
but when I get to "step 10. click on the upgrade option" the "upgrade option" is greyed out.
Why am I not given the upgrade option and what do I do now.
Thank you