I don't know why either version past 3.3b4 causes my OS to hang. Both v.3.4 and 3.405 do not function and both versions identify "GUI" as the source of the problem. I have tried Installing both. Deleting pghash and pguard or not deleting doesn't matter; I have tried Install of v.3.405 both ways> No Good. I know I've posted in the past about basically the same issue, except the earlier posts I was using v.3.150 and could not get v.3.405 to run on the OS. Wouldn't you know it, through all the hours and the 'crap', I ended up finally, with 3.3b4. But thats as far as it goes. Any version higher and OS hangs without completing Start Up. Any solution?