Did you end up sorting this out?
I hooked up my AVGA and arcade monitor for the first time today and I experienced pretty much exactly what you went through.
Luckily I could get the drivers on no problem as the CD that came with the AVGA (mine came from Ozstick) would autorun upon booting the pc - thankfully that menu screen is big, bold & easy to navigate!
You could try setting your windows to auto run in case it's currently not.
What I had an absolute nightmare with was the fact that after the drivers were installed I set the display to 640x288 BEFORE I ran the auto res utility.... meaning I couldn't read half the menus in windows.
I was forever guessing where to click, couldn't move windows around enough to see all the info at once, text was hard to read, it was hell.
Even my attempts to get the ATI drivers to autopan the desktop (ultimarc's site made it sound like that should work) were useless - the option wasn't even there.
Maybe someone more knowledgable should add a numbered order to do all these steps into the monitor FAQ?
I sorta got there eventually in the res tool (but may re do it soon) so now most games aren't rolling vertically in game and I am ready to move on.
BTW I just got done reading the retroblast monitor setup article;
http://www.retroblast.com/articles/monitor.htmland his method of adjusting each resolution with the Nokia tool seems great but I think it's only for multires/trisync monitors right?
My monitor is an original arcade 25" from the early nineties in an Australian LAI cab, pretty sure that's only standard res...If so I am guessing I'd need to pay attention to the "Mame Prep" section of that write up and in particular the settings for vertical games (since my monitor is horizontal).
It would be fantastic if someone here can verify my hunches or correct them.
I may be stating/asking silly things as I've crammed all my research in just today after not having a chance to work on my emulation hobbies for a year basically.
PS. Forgot to say Galaga is the only game I noticed still acting up, rolling from top to bottom (I had a ten min play test of heaps of random games) Is there something special I need to do to get it working right?
Can't have a cab without that classic!