I am experiencing the exact same error when trying click on a link for
a .txt file. I have no trouble with .pdf files or .doc files. In fact
those file extensions open just fine in the browser frame. But once I
receive the error described above and attempt to access Tools>Internet
Options I get the "restrictions on the computer" message. If I quit
out of the browser and then re-open it, I can access Tools>Internet
Options just fine. I'm running XP Pro SP2.

Anyone out there have any suggestions?

Thanks,

Alan