The OP doesn't know much about computers or the software that runs on them. Don't give them anymore of your time. I'm not sure why I am even replying.
I do know that we rolled out IE9 to around 2000 computers at my work and the users were very ELATED to receive the upgrade.
The browser isn't crashing on them like before, stalling on loading up, is more compatible with websites and because I am in IT - we would like to have these computers run more secure. (We give our users administrative access).