Family Safety not recording activity, listing false activity

I have three kids' accounts set up in family safety.  One child's  PC activity is not being reported. It is not showing facebook activity for another child, but showing facebook and twitter activity for a child who is not old enough for an account, and both of those sites are supposed to be blocked.  I have run the trouble shooter twice, and it comes back and says files are corrupt.  I follow the instructions and reboot the computer, but nothing changes.