Hey this might be an issue due to some missing Internet explorer files. Well I ues reinstallation of the IE8 might fix this issue. There is an option to install IE * in Win 7 also. Here is that..
GO to Control panel>Programs and features>Turn windows features on or off
There you can find the IE 8 with a check mark.
To uninstall the IE 8 go ahead and uncheck that and reboot the computer.
After reboot go back to the same location and put the check mark back and reboot again.
The IE 8 should come back fr sure..
Hope that this will help you with your issue, Post back what hapened....