Buggy Internet Explorer 7

I can't stand the new IE 7.
I shouldn't have installed it 2 weeks ago.
Now, I don't know how to go back to IE 6.
When I open more than 7 windows (around that or more), it will slow down tremendously.
Most of the times, it is not responding, and then give me the error message that it has to close.........Tak boleh tahan.
Its interface changed quite a lot. I need time to play around and get familiar with it.
Anybody out there knows how to go back to IE6 from IE7?
It's always good to try out new stuffs. However, if it is unstable and buggy, I will rather wait for them to fix the bugs before updating. Good lesson siah.............