Multiple programs not responding

Hi ,

I'm having a problem with my imac when i log in everything freezes up i have managed to get the activity monitor working before mail and safari get stuck with the dreaded spinning ball ( they both open at log in ) .The monitor eventually comes up with the message program not responding.when I click on the finder it also comes up as not responding and I have to switch off with the power button. I have logged on in safe mode and gone into disk utility and there is no problem with the hard drive i have also repaired disk permissions and i am still having the same problem. When i log into my wifes account everything is working fine .I was wondering if anyone could help me!