tetonbob

It appears that some of your SharedAccess key is missing or corrupt.


Go to Start->Run and type in regedit and hit OK. Highlight this key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess

Go to File->Export and save the key somewhere as a backup. Close the Registry Editor now.



Download this regfix:
http://windowsxp.mvps.org/reg/sharedaccess.reg (right-click and Save As)
Place it on your desktop.
Now doubleclick sharedaccess.reg
Ckick yes/ok at the prompt.

Then REBOOT!! Important!

After reboot, go to start > run and copy and paste next command in the field:

NETSH FIREWALL RESET

Click ok

Wait till the Dosprompt (black window) closes again.
Then look if you can access the firewall settings again.