Q -

The C:\ in the error description probably indicates that your browser is looking for something on your own machine, since that indicates a "local drive" in most cases. The folder name "null" is not often used on "Windowy" machines, although it does pop up occasionally on UNIXy machines.

It looks like your browser is going to your C:\ drive for an instruction that's not there. (I'd expect something more like c:\webserver\mudcat\htdocs>nul in such an instruction, though.)

Rebuilding your links/favorites files sometimes is necessary housework. Hope it helps. A "Disk Cleanup" run sometimes also clears up problems with links, too.

John