I find that strangethat it loses it;s settings. its not supposed to. they retain their settings after even long power loss. when you save your settings in the router's configuration, they stay, its the type of memory that is in them, flash memory.
what i suggest to check, is make sure you have a static ip address before you port forward through your router. d-link uses 192.168.0.1, and by default, dynamically gives out ip's from 192.168.0.100 and on, so, give yourself an ip lower than that, like 192.168.0.50, anything below 100. for ease, use the router's ip for dnsm and default for subnet mask.
your software firewall could be an issue, if you have any, dont forget windows xp sp2 firewall. before you do any of this, go to this link and get and flash your router's firmware, then you have all the latest hoyfixes!!
post back with any questions!.http://support.dlink.com/products/view.asp...tid=DSL%2DG604T
i think you may have the numbers mixed up on the model, so check them on the link before you download the firmware k.