I have a MacBook running a 10.7.5 OS.  Of late it has started hanging, especially when I use Safari.  Can anyone help?

I have a MacBook that's four years old, runs on iOSX 10.7.5 but of late has been hanging, especially when I use Safari.  Can anyone help?

Carolyn,
I searched my whole system and couldn't find
com.apple.systemuiser.plist
So that is a mystery.  However the part about:
Go back to System Preferences > Network
Make sure the box is selected next to:  Show Wi-Fi status i menu bar. Solved the problem.  Somehow the box had been unchecked.  Gremlins I guess!
Thanks so much for your help.
L.

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