Assuming Word 2007 and not 2008...
Office Button > Word Options > Advanced >
[x] Show field codes instead of their values
I suspect you hit the key combination by mistake. It is a toggle. The other F9 keys are:
F9 - update selected field(s)
Shift-F9 - toggle display of selected field - code/result
Alt-F9 - toggle display of all field codes in document - code/result
Ctrl-F9 - Insert field code pair (and if text is selected put it inside the pair)
Ctrl-Shift-F9 - Unlink selected field
The F11 key also deals with fields
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