Power Point help

When someone sends me an e-mail with a power point attachment
& i try to open it, it opens up with
a program that can not open it to view..I do have windows power point viewer, but when i click on it, it opens up my folder options & not the e-mail...How can I make all e-mailed power point stuff open up when i click on them as an attachment
in an e-mail?

I am using Incredimail..It worked just fine with my old pc & windows XP..Now I have this new pc with windows 7 & the problem exists....

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