The IT "guy" should have given more detail as to why. I am no expert but am guessing you need to go back to 4.3 OS. Why did you go so quickly to 4.5? Again, don't do anything until one of the experts replies to your problem.
Don't worry. You just need to go back to your previous version. It's a little bit of a hassle. But plenty of threads in this forum to help sort you out.
I definatley did something wrong.Now I don't have a browser OR email. Does anyone happen to know a link to a recommended OS? My boss is gonna kill me! I didn't even back up right before I did it and I can't restore: