Ok, just ran into the same problem.... when equiping a 2nd ring... CTD without fail...
WinXP Sp2 fully updated, Dxdiag perfect, running patch 1.34. Nvidia display card, latest drivers etc... i checked all the stuff that normally makes a difference... no spyware... no viruses, crosschecked all that with various proggies.
hmmm its just irritating, when playing and a dead monster drops a ring, i need to drag it into inventory, otherwise it tries to equip it and crashes....
I even re-installed the game, loaded my save and the same thing
Another thing i noticed.... (not that it bothers me too much), is that i cant swop weapons quickly... i physically have to unequip the 1 weapon and then equip the next, otherwise it just wont change it.