Pretty weird if it won't even open the template off the local machine, which means it is not likely related to networking. Never seen anything like this.
Do you have other versions of AC on this machine? If not, then try uninstalling yet again. Once you've uninstalled, go clean up all of the lint left behind.
In c:\documents and settings\username\Applications Data and Local Data or something like that, delete any GS/AC related folders.
In regedit, go to HKLM and I believe it is Software, Graphisoft and delete that. (I'm on a Mac right now, so can't check the paths for all of this.)
Reinstall yet again. Don't run it yet. Install the last AC 9 hotfix.
Now try?
If it locks up again, it could be graphics card related as you suspect, but doubtful.
Can't remember if AC creates a crashlog in the App Data folder... might give some clue to what is happening. Again, not on my windows machine right now to check...
Are the other machines at your office upgraded to SP3 also? (I thought SP3 was still a beta download.)
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB