Vista - Microphone not detected after installation of SP2

Hi guys.
I'm on my friend's computer at the moment. It has a strange problem. The microphone, after installing the 64-bit SP2, is not detected anymore by Vista/Creative SoundBlaster X-Fi Extreme (PCIe 1x).

The microphone in question... is a simple microphone. Not USB.

His config is :
Intel Core 2 Quad Q6600 2.4GHz
4GB of RAM (1033MHz DDR2)
320GB of Hard drive
Ati Radeon 4850 512MB
Creative SoundBlaster X-Fi Extreme Sound Card
Realtek HD On-board Sound (Desactivated)
Windows Vista Home Premium (FR) x64

The drivers are up-to-date. I even desinstalled them and reinstalled them. Of course, I tried to connect/deconnect.

Are there any other things we could try? (Without spending a penny please).

My friend wants to try everything possible before getting on the on-board audio chip.

Thanks for helping.

EDIT

Something was wrong in the creative software. But we got it working now.
Thanks anyway.

I hope someone helps because I have the same problem and I am running almost iden tical hardware. I am using Vista Ultimate (64 bit).

I am using Soundblaster X-Fi Platinum Series.

Windows will nor recognize the microphone.

^ It has to do with the Creative software. I don't remember exactly which one or where but in one place you can change what jack does what. In that choice, I think you have "Microphone jack". The problem lies in the Creative software. It's not Windows

Keep searching.