I installed 10.4 32bit which seems to work fine. Once I tried to use the calendar function it hung. Restarting made no difference. I tried to go back to 10.1 without success. I uninstalled 10.4 and 10.1 and went to 9.5.1 which works fine. Reinstalling 10.4 didn't work. Trying repair and it made no difference. Anything else I can try?