On Windows, sometimes you also need to reset Windows Security settings to default to fix some connection errors, stop working ...
The first thing you should do is click on the Restore Settings placed right below the error message and see if the issue is resolved. Sometimes, Windows revert back ...
I cleaned out the hijackware and start-up stuff with HijackThis! and got rid of the trojans and the crapware apps that they installed, but I now am sitting with a pretty much useless Windows 7 ...