Hi De-Daniel,
Try the steps from this article on
Change which programs Windows uses by default
http://windowshelp.microsoft.com/Windows/en-US/Help/6ef5399f-a0b6-4133-ac76-41cda36b1ca21033.mspx
Hope that will fix your problem, please post back and let us know ok.
JohnD
Microsoft Answers Support Engineer
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