Microsoft FIX IT SOLUTIONS Not Working

For some reason the Microsoft Fix It Solution Centre will not accept, and so help me, with problems. Instead, I get the message :Fix It trouble Shooter cannot continue because an error occurs.This Trouble Shooter doesn't apply to this computer.I have been able to make use of this facility since my PC was new (last May) and this is a recent message.I see, from Google, that others complain of this problem butseemingly no solution has been given, although the failure to install Update KB976902 has been suggested as a possible cause of this problem.I have checked, and this update was installed successfully on my PC.