IE8 problem.

I keep getting the following message when I try to use IE8 on my desktop:-

"Internet Explorer has encountered a problem and needs to close. We are
sorry for the inconvenience."

I have used CCleaner to get rid of cookies, temporary files etc with no joy.
I have also uninstalled IE8 and returned to IE7 and everything worked fine.
I then reinstalled IE8 and and was able to use Internet Explorer until I
rebooted the computer. Back to square one, no internet.. I know that I
should now return to IE7 but would first like to know whether there is a fix
for this problem. I can't find anything specific on the Microsoft site
(using my wife's laptop).

Many thanks for your help.

Joe