Can't load PDF files from IIS7

Hi,
I'm using Windows Server 2008 R2 with IIS7.5 and I have a problem that started a week ago that I can't load PDF files when browsing from any browser.

When trying to load any PDF file, it looks like the process begins, and suddenly it stops.
I tried this: http://support.microsoft.com/kb/979543 but I'm getting an error message that says: "The update is not applicable to your computer"

MIME type is OK.

Anyone?
aPendLtdAsked:
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jgutz20Commented:
Can you open it by going into the Adobe Acrobat Reader and opening via the URL?  Curious if it will load that way which will tell us if its something up with the browser or possibly the pdf file itself
nedysCommented:
Have you installed Service Pack 1? SP1 contains hotfix 979543. This issue is also discussed here http://forums.iis.net/t/1161071.aspx?PageIndex=1 . Discussion contains solution using http handler in application which can temporarily help until you find solution for the entire server.

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