if you have any version less than version 6 ,download it and install it and check if that would help
looks to me from that adobe link that the file that you are opening is not associated with pdf. so once you install adobe acrobat reader 6 do this open acrobat reader go to edit > preferences > internet and check display pdf in browser
close browser, open it and check
also clear temp internet files , cookies"
Hope this helps. G
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