Why do funky characters show up in these Microsoft Word equations?

Why do funky characters show up in these Microsoft Word equations? A colleague sent me a document created with Microsoft Office 2007 that contains equations. On her end, the document looks fine; however, on my end, the equations show up with these funky characters overlaid on them:
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Guest [Entry]

"This correctly resolved the issue.

Delete the following two files from C:\winnt\fonts:

symbol.ttf
symbole.fon (hidden file)

Copy the above two files from another computer to a different directory, e.g. C:\data
Go to the location C:\winnt\fonts
Go to File > Add Font
Add the above two fonts"