Bluetooth missing in preferences 10.8.4

when updating my wife's macbook pro 13" mid 2010 to 10.8.4 from 10.7.5.
after the install the blue tooth prefrence is missing within system prefrences.
the same upgrade was installed on my macbook pro 15" and works fine.
I tried copying my system prefence contents and replacing the 13" macbook pro's system contents severl times with no change in the missing bluetooth
prefrence. is this perhaps a module issue or ?
what might be the best way to address this issue ?
p.s my wife loves her bluetooth track pad...
thanks in advance

The built-in Bluetooth adapter isn't working, and that's why you can't see the preference pane.
There's a slight chance you might be able to fix it by resetting the SMC:
Intel-based Macs: Resetting the System Management Controller (SMC)
Otherwise, make a "Genius" appointment at an Apple Store.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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Bluetooth missing in preferences 10.8.4

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