Originally Posted by Peppurr101
Like for me.I also had this before installing this hotfix.
In my Firefox add-ons, the .NET Framework Assistant 1.1 used to be there, but disabled with an uninstall option. Today, after the error messsge, it now has a red exclamation point next to it, and the 'enable' button is greyed out in favour of the 'uninstall' button. It would seem that Firefox wants me to uninstall this add-on?
By me after few browser restarts this add-one was again available and I disabled it pernamently.Maybe I also decide to uninstall it completely.If restarting browser don't help you or this error appear again uninstall this add-one.
If so, what do I do with KB974455?
In my opinion .NET Framework Assistant is defective not this hotfix. EDIT
Because again I have trouble with .NET Framework Assistant in Firefox I'll uninstall it completely