My first recommendation would be to use Firefox
instead of IE. Internet Explorer sucks, in my opinion. I am always pissed off when I am forced to use it.
Although, IE itself may not be the reason you are having problems. If using Firefox resolves your issues, then the problem was IE. But if you still have problems running Firefox, the cause is obviously deeper than a crappy browser (IE).
What version of IE are you using? 7? 8?
Try updating your Flash Player
and Shockwave Player
What are your system specs? Processor, RAM, hard drive, graphics card, Windows 7 edition and bit, etc...