I have managed to ged rid of the problem by uninstalling Google toolbar plus numerous other things as mentioned above (which didn't work) but then found another site that said to go into Internet Options, Advanced and then unclick 'Enable Third Party Browser Extensions (restart required) (sic). This finally worked ... yippeee ... BUT
I like using the Google Toolbar and reinstalled it (as a lot of other people say they don't have a problem after that but unless you agree to their terms it won't install it so did and it automatically changes the setting in Internet Options causing the same problem which is easy enough to fix again (now I know what to do) but then it removes the google toolbar.
I have downloaded from the site as you suggested which makes no difference ...
HAS ANYONE FOUND A WAY TO KEEP GOOGLE TOOLBAR WITHOUT GETTING THIS RUNTIME ERROR?
Go to this website and install it.
So far, it has worked for me...I haven't gotten the error since I installed it..