Windows Vista not Genuine

[Humandecoy]

Ok so I have had this computer for about 2 years. Just recently i picked up a new game (FFXIV) and it requires me to install Windows Vista SP2. So i go to update my windows and there is about 20 updates. I try to update and nothing happens after i restart now every time i log in i get a box telling me to activate windows now and the copy I'm using is not genuine. Tried updating and tried activating and no go. Anybody able to point me in the right direction to find out how to fix it?

Windows Veriso-Vista Home Premium
Service pack 1
32 Bit Operating system
Processor-AMD Phenom II X2 Processor 555 Black 3.2Ghz
Ram-8.00GB
Computer make model- Huh?
HD-500GB Western Digital
Soundcard-SoundBlaster audiology
Video card- 250GTX
SPYware/Antivirus-Avast Antivirus
Real Windows CD-Yeah i got it and the keynumber thinger

[Geek-9pm]

Real Windows CD-Yeah i got it and the keynumber thinger

What does that mean?
At one time it was tested to be legitimate, - Right?

There is an issue where if you do not use your PC or keep Vista updated over time you may get that message.

If you can not resolve the problem, contact Microsoft.

[Humandecoy]

The number thing that comes with the CD i have it as well. Its been awhile since i updated it so i guess maybe thats the problem? I can not resolve the problem thats why im here heh. Thanks for the advice

[Geek-9pm]

Without the details, I can only guess.
This was a home built?
Wa the CD a standard retail item?
Actually, a full install of Vista is a DVD. There are different versions of it. It should have a part of the rim with a hologram.

Here is an idea. Find a good Hard drive in your spare stuff. Put it into your machine. Install Vista from the DVD by booting from the DVD. Use the number that came with the DVD.  Even without the updates, it should give you some time to activate the new installation..

Look this over and see if it applies to you.

http://answers.microsoft.com/en-us/windows/forum/windows_vista-system/how-to-identify-which-windows-is-my-serial-number/54a862df-8d1d-42d2-b2f7-91a68f7e3313

Or borrow a proper Microsoft Vista DVD(not Dell, HP, etc).
A proper Vista DVD contains all Vista versions.
The Product Key determines which Vista version gets installed.

This seems to say it is OK to borrow a DVD and install it. The product key makes your install legitimate.