You could try to replace the guistore.chu in the override folder with the one in pst-1280x800-ui/backup.
Also, try delete dfell.dlg from the override folder to see if it's faulty.
Are you on 2 cd version btw?"
When I used the guistore.chu from pst-1280x800 version it still crashed but know the error says something about controls now.
Fell's shop is not the only problem. All shop interface's in the hive crash(save Emoric's since I haven't gotten to that part yet)
I am using the 4cd version.
I found a temporary(it's tolerable) solution by deleting guistore.chu in the override.
The Store Interface doesn't crash anymore but of course every time I enter a shop the interface would be on the top left.
I'll get used to it.

I'll check back here if you guys have more info.
Thanks again.