If you have a separate software firewall, there's no need for the XP SP2 firewall at all. Just use one or the other.
What model SACM do you have?
For the signal levels, try using "root" as both the username & the password when you visit 192.168.100.1
Mentor router?
Try connecting the PC directly to the modem, bypassing the router. You'll need to reboot the modem when doing this (see
http://homepage.ntlworld.com/robin.d...swap.html#swap for how & why).
If it's fine without the router, then perhaps the router is a problem.
Also, have a look here to see if there's any other relevant info you can post -
http://www.cableforum.co.uk/board/sh...ad.php?t=15305