Thank you for contacting us here on the answers forum and i am sorry that you are having a problem with IE8. I woud like to try and get you up and going again with IE but I do have a few questions about the computer that you are using. What operating system are you using? DO you have a 32 or 64 bit operating system? Here is a few articles that may help you get the slingbox up and going with IE.
Hope I could be of some help,
Sling Moderation Team