Lets see...
Do a virus/spyware scan
Defrag your computer
Uninstall/Reinstall IE
Go to your event viewer (search event viewer in your windows search or go to start>run>msconfig>tools tab>event viewer
Once your in event viewer, go to the Application and Services Log>Double Click Internet Explore>Is there any error messages?
If nothing is in that panel, Click Windows Logs on the left & Application below that. There will be a ton of messages, but try to find one thats associated with your IE8 crash.