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.