I have a brand new laptop, Intel Core i5 CPU, 8 GB ram, running 64-bit Windows 7. It came with IE 9, which locked up 50% of the time.
I eliminated Silverlight, thinking that could cause some problems. Tried a few other things gleaned from internet search solutions, I downgraded to IE 8.
Everywhere I look I see the same problems mentioned that I'm having, and the problems have obviously been going on for several years with ie8/9. IE 8 just quits working and ask if I want Windows to check for a solution.