Goback and Access IBM both want to be installed in the MBR. When GoBack is installed, it inserts itself in the MBR and then saves the MBR that was previous there in the goback.bin file. If you want to use Access IBM, then you need to disable Goback. When you disable GoBack, the original MBR is restored and you should be good to go.
I assume you are still getting the GoBack screen at boot time?
It's a bit of a headache, but I continue to use GoBack as it has save my a** several times.
Let me know how it goes.... I've had a GoBack/X41T writeup on my todo list for some time... any additional information would be welcome.