Nope. I just bought the CD and installed it. If it helps any, this Vista software is an OEM

Thats actually good news.
On the sleeve of the CD (folder that it was in)
You will see a 25 didget, number. It has numbers and letters. After each 5 numbers there is a -. That is your key.

Yeah Here is the Product Key that's on it but it won't accept it:


richc46 removed product key number.

Ok, Still no problem
Try to put that Zero in as an Oh

I removed your product key number in your post. That must be kept confidental. If someone sees it and uses it before you, it will no longer be valid for you.

It won't let me use neither "0" or "O"

OK
The number was on the sleeve and you are very careful about how you enter the number?
How many 0 and Ohs are there in the number. Ignore OEM (these are all letters)

They are 4 0's

Ok
heres the thing 99% of the time when there is a problem putting in the number. The users gets confused between 0 and OH. I think this is what you are doing.
You cannot make them all OH or all 0. Look very carefully at the number, there is a difference between 0 and OH, make sure that you are putting it in correctly.
Use a magnifying glass.
Make sure THIS is the sleeve that came with your current Vista.

Let me try using my administrator account since I'm on my other account.

Nope. Nothing. When clicking on Activate Windows, there's a pop up window that comes up that says "The Windows VistaTM Ultimate Product Key You Typed In Is Invalid For Activation"