Problem after update, on boot I just get blue screen

Hi,
I ran into issue with my wife iMac that I can't figure out.
After recent update, first Skype would slow everything down but only on my wife account (it is her machine). When we log in under different account, everything seems to be working.
Now all I get is blue screen where login screen should be (after restart_.
When I try to boot (I restart it by using button on the back) with pressing Shift to go into Safe Mode, it works ok.
I guess there is a problem with recent update, how do I roll it back. Any other suggestions would be helpful.
I am not experienced Mac user, this is really frustrating and this is not the first thing that doesn't work. However this really prevents us to use it at all. Any help would be welcome.
Thanks.
Zeljko

Try running +Repair Disk Permissions+ in Disk Utility after starting up.
I find it to be a good practice to run +Repair Disk Permissions+ BEFORE installing software updates, especially those that update the system.

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