font and character changes

I work in an office with several workstations. When I open, print, create,
etc. a file from one of the work stations, it changes / converts the font
size and also it changes / converts the apostrophe ' into an equal sign =.
This only happens on one work station. This workstation is running Microsoft
Word 2002 SP3 and running Windows XP Professional, Version 2002 SP2. Any
ideas? I've tried to reinstall Microsoft Office and that did not help.
This has been going on for some time and have no idea the date to use for
system restore. Thanks!
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K.Sawyer