Hmmm... we've done some upgrades to IE 7 without too much trouble. Did something go really bad wrong during yours, I take it?
My Internet provider is JUNO. JUNO and IE7 are not good marriage prospects. I couldn't connect to the Internet most of the time, when I could connect it made my 56K dial-up modem fell like 300 BAUD (Shudder)! When it did connect it took more than 5 minutes just to reach my Email, which is an Internet based Email! It would lock up the computer, which is a 3400 Athalon, with 1 GB of RAM and a 200 GB hard-drive, so that I had to cold boot it just to turn it off!