I'd like to add more to what I just said. For years we've been running Windows XP Pro on all users' desktops. This year we're transitioning to Windows 7 Pro. Windows XP tended to run things in more of an "administrative" mood, whereas Windows 7 almost always runs as if you are a regular user. For better, or for worse, we got in the habit of making everyone an administrator, on their own PC. (It's a practice I don't like, but the IT group that used to administer us did that, and so when they left we continued the process.) So, what we've found is that when the user first tries to use any of our SSRS 2005 reports, it first attempts to download and install the RSClientPrint.dll, and if the user isn't an administrator on his/her machine, then that fails. Once that's happened, there's no fixing it.