Eurgh... Please, don't triple-post... Nobody likes that... Just use the effin' "Edit" button in the top-right corner of your prev. post...
I'll edit the info I find on the Matrox card to this post.
Edit: Yes, I believe I see it now... You have the wrong drivers.
Now, here are the links where you can download the drivers for Win9x/ME, WinNT4, Win2k/XP and Linux.
Hopefully this helps.