Brian,

As usual, when posting questions on these forums, please give us as much information about your computer as possible. The operating system, processor speed, amount of RAM installed, and in this case, the Acrobat Reader version that your are using, would sure help. The more information you give us, the better informed our answer will be.

If this is the first and only time this has happened, then I wouldn't worry. If you've got an older version of Acrobat Reader, you may want to install a newer version, such as AR 5 or 6. And if this is happening frequently when on the internet, check the Acrobat Reader settings, by opening Acrobat Reader, click on "Edit", choose "Preferences", then select the "Internet" option (at least that's how it is on this AR 6 version), then place a CHECK mark,(or possibly even remove it) from the "Display PDF in browser" and "Check browser settings when starting Reader".

Hope this helps.

Grif