Microsoft Excel Won't Open

i have 10.7.3 installed on air , realized microsoft excel , powerpoint not open. gives me run error every time try open them. else getting error?

attached pic of error pops every time.

 

attached files:

• 

  screen shot 2012-02-21 @ 1.44.07 pm.png

  file size:

  45.7 kb

  views:

  85

i'm running same version, , excel working fine here. can try reinstalling excel?

 

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