I found this in an older forum posts:
desolationw 03-23-2007 at 12:33:10 PM Show message
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+ .I had to update my x1950Pro drivers in Vista by
Running ATI setup and cancelling after it has extracted all files then:
'Update Driver>
No, not this time>
Install from list>
Don't search, i will choose>
Have Disk. . .then browsing to the ATI folder on the C: you have just extracted and choosing the .inf file
Try it and if it works, thank desolationw.