Before I came back and read your last 'post' Harry, I had deleted PI (using windows uninstaller), downloaded and installed a fresh copy.
This was dated 28/12/11, and of course when opened, showed the same problem.
I then followed your instruction, and run the reset under the windows start menu, which did clear the problem.
![smile :)](http://pixinsight.com/forum/Smileys/default/smile.gif)
However, it seems to have restored PI to how it was before the version with the 'bug' was installed, as I have a nice clean 'process explorer' window, with no documentation add-on.
Is this how it is supposed to be, that is with no documentaion extension window?
Dave