When IE crashes
After wasting a lot of time I found out how to fix it.
Problem: IE crashes when you click a button in a Web Dynpro view with an Adobe Interactive Form in it.
2 possible solutions:
1. Make sure you have admin rights in Windows
2. If that doesn't fix the problem:
uninstall acrobat reader
delete the activex control 'AdobeControl' in C:\WINDOWS\Downloaded Program Files
reinstall acrobat reader