A few things to try:

One:
- uninstall download manager
- uninstall Netscape
- reinstall Netscape (from CD, if you can't download)
Check after the first point if it works already.

Two:
- use IE and see what happens

Three:
- uninstall download manager
- then go to point Two

Repeat all three ways with Zonealarm shut down, if necessary. But that shouldn't be the issue, I think.

Kees