Hi again,
Just thought I would update everyone with the results of this in case someone else is pulling their hair out.
DxDiag would not run properly, I did not get the display tab, but the /nohardware switch worked perfectly.
The software runs fine now, the user opened it op and opened a file, played around for a bit and nothing crashed.
Thank you so much for your assistance with this, there is no way it would have been possible to resolve without your help.