Suddenly my Internet Explorer in Windows Vista started to act strange. I could not right click and get the shortcut menu showing and nothing happened when I clicked on the >> for example.
Suddenly IE7 crashed after I had clicked around for a while. Usually IE starts again and I waited a while. In the meantime I went over to Outlook and right clicked on an email and it didn't show the menu there either.
I found in the task manager that iexplorer.exe was still running so I killed the process and things started to act normally again. Not a permanent solution as I still don't know why it failed in the first place but I have not seen it again.