Users have reported an issue in which Adobe Reader does not function properly under Windows 7. In particular, users report problems with intra-browser viewing of PDFs, noting that they sometimes get a blank pop-up with an Adobe title and an OK or hangs in the browser when attempting to view PDFs. The problem is most likely to occur in Internet Explorer 8.
Use an alternative reader
Several users have been able to quickly an easily work around this issue by installing and using an alternative PDF reader. One good choice is the free Foxit Reader. It tends to use fewer resources than Adobe Reader, and works well in Windows 7.