I click on the attachement and a screen pops up and say's "There was a error opening this document. The file cannot be found.

Any help will be appreciated.

I would try uninstalling and then reinstalling PDF Reader. If you're using the Adobe PDF reader, I'd suggest uninstalling it, and then installing FoxIT Reader instead... either one will work, but FoxIT always seems to work better for me.

It sounds like the file association got messed up somehow, so when you reinstall, it should create the association again.

I agree with retsoksirhc's suggestions, but another thing that might be wrong is that the attachment itself could be corrupted. At the least, I'd recommend downloading the attachment, and then opening it up from your hard drive, as opposed to through your email.

Do you have the latest version of the Reader? They are free so the first thing I would do is get the latest version from Adobe.com.