Currently Being ModeratedJul 25, 2013 7:32 AM (in response to CCareyDesign)
Welcome to Apple Support Communities
Check that you can get these preference panes back. Open System Preferences and go to View menu (on the menu bar) > Customize. Tick "Bluetooth", "Network" and "Sharing", and accept changes.
If you don't see them, hold Command and R keys while your Mac is starting and reinstall OS X. You may want to make a backup of your files with Time Machine > http://support.apple.com/kb/HT1427
Currently Being ModeratedJul 25, 2013 11:22 AM (in response to mende1)
I don't know how they unchecked themselves. Thanks so much for the answer.