I have Adobe Reader 9.1 on Windows 7 OS. Often when I click on a link that opens a Adobe file I get a blank page and a BLANK error message from Adobe with only an "OK" to click. If I go back and try again, I get the same thing but as they say, "third time is the charm" and the file will open.
Reader 9.1 is not compatible with Windows 7. Update to Reader 9.4.4 or the latest Reader X.