I had the same trouble when I installed IE8. Same set up as you, but a desktop not a laptop. My solution was to revert back to IE7 after that I've not had any problem.
My PC used to have IE7 and I upgraded to IE8. But then when the trouble started I uninstalled IE8 and the PC reverted back to IE7. In other words I didn't have to reinstall IE7 it was still there.