System Bonjour

Is your system saying the Bonjour Service has been disabled?

If so:

In your Start menu, right-click "Computer" (or "My Computer" if using XP) and select "Manage".

Expand "Services & Applications".

Open "Services". (Perhaps maximise the screen to better see what's going on.)

Right-click the Bonjour Service and select "Properties".

In the General tab, set the Startup type to "Automatic":

... and click OK.

Restart the PC. Do you still get the message about the service being disabled?