my powerpoint icon is blank


I have office 2007 installed on vista and everytime i right click and choose new and choose microsoft office powerpoint presentation i get a blank powerpoint icon but that doesnt happen with word or excel and every other office 2007 application..Even when im using the powerpoint application and i save a ppt from there the icon appears blank..Please help as this is driving me crazy..

i have a pic below of the word and excel icons showing right and the powerpoint icons blank -
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