Insufficient information. Your problem is not made any easier by the fact that website driver support for Advent PCs is very poor. I can't even find the website! Do yourself a favour and Avoid Advent PCs in the future
The motherboard info you gave (MS-7091 ver2) is not recognised
on the Microstar website.
Please download belarc advisor and run it on the affected PC, then post it's info report on the forum.
Belarc Advisor:
http://www.belarc.com/free_download.html