Windows 7 - Two Matrox Parhelia AGP+PCI Windows 7

I've got two different graphic cards installed on my ASUS P4C800E-Deluxe.
1 Parhelia 256MB AGP and 1 on PCI.
I've also 3 Philips 22" monitors connected: 2 on the PCI graphic card and 1 on the AGP.

On Windows XP I can extend the desktop on all the 3 monitors.

Windows 7 (ultimate) detect the 2 graphic cards but switch on only one monitor for each one.

May anybody help me, please?

fabioweb, welcome to the Seven Forums.

Best you're going to get for cards that old,

Matrox Graphics - Support - Driver Download

but did you remember to install the drivers for them?

I've an old PC.
But it works and is perfect for me:
ASUS P4C800E-DeLuxe
4GB Corsair TwinX RAM
Pentium IV 3.2 Extreme Edition
Matrox Parhelia 256MB PCI (2 monitors)
Matrox Parhelia 256MB AGP (1 monitor)
Matrox RTX100-Pro
3 x Monitor Philips 202P4 (22"CRT - I've also another one that I've to connect)
2 x 150GB SATA HD in RAID 0 (System XP)
1 x 85GB EIDE HD (System Windows 7)
2 x 120GB SATA HD RAID 0 (Video editing with Matrox RTX100 Pro)
2 x DVD-RW External USB
1 x DVD-RW External Firewire
1 external HD USB 500GB
1 x external HD USB 2TB
Creative External DSP and Creative 7+1 Audio speakers

Windows XP Professional SP3 (extended desktop 5760x1440)
Windows 7 32 bit SP1

I've downloaded drivers for Vista. I thought they were ok.
Wath I cannot understand is why the second monitor on the PCI Parhelia doesn't go on in Windows 7.
It works fine in Windows XP

Works in XP because there is a fully working chipset driver for the motherboard, for Windows 7 it is probably making do with whatever default drivers that Windows installs; the big one being the AGP/GART part of the chipset which is required for an AGP card to work properly.

May or may not help but start with this,

http://downloadcenter.intel.com/Deta...=1043&lang=eng

Be a good idea to uninstall the video card drivers beforehand, and then re-install if the chipset update installs/updates.

It does'n work.
I've uninstalled the Matrox driver and I've updated the Intel Chipset Software.
But nothing have changed!
The secon monitor connected to the Parhelia don't want to switch on.
I must solve this problem!

Another question:
Where can I find Audio driver for Sound Max on ASUS P4C800E-DeLuxe for Windows 7?