Airport Express won't detect modem

I'm running XP home on a Dell Inspiron 510m with Dell 1450 b/g wireless card. My current internet connection is via Ethernet to D-Link DSL-300T modem and my internet provider is Zen (PPPoA). Being a fixed line guy, I have no WEP/WPA wireless encryption in place at the moment. In addition, there is no firewall etc. in place at the modem level. The fixed intenet connection has worked like a clock for the last 5 years.
In an attempt to go wireless at home, I just bought an Airport Express on the basis that many people view it as easy to set up. The problem I encounter that the AE does not leave the "amber flashing state" after startup. According to the modem, the ethernet connection to AE is OK and the second I disconnect the AE and plug the cord back straight into the computer, I'm back on the internet. My conclusion is that the AE does not recognize the modem and its ethernet connection.
I've tried a variety of different approaches to get the AE to speak to the modem:
1. Modem on and connected to AE at the time of AE startup
2. Modem on and connected to AE at the time of AE startup, subsequent reboot of modem after AE startup sequence
3. Modem off and connected to AE at startup, modem start after AE startup sequence completed
4. Modem on and connected to AE at the time of AE startup, reset of AE after AE startup sequence
No matter what I try, I still end up in the same situation (amber flashing light). AS there at this point is no network established, I can not use the Airport utility to pinpoint the exact source of the problem.
I would be most interested in learning the thoughts of anyone who may be able to help.
Thanks and regards

Duane, many thanks for your reply.
I believe I have the setup suggested by you:
Phone socket ---> D-Link modem (PPPoA/DHCP server) ---> Airport Express
The D-Link DSL 300-T modem is set up to handle all aspects of the connection to my ISP, including PPPoA. In addition, the modem is set up as a DHCP server. In my world (but I'm an amateur compared to most posters on this forum) this should mean that the modem is set to furnish the AE with the correct type of connection. Am I missing anything here?
I gather from reading on the internest that the problem may actually be one of compatibility between the AE and my specific D-Link modem (DSL 300-T). It has been suggested that downgrading the firmware in the AE to an earlier version sorts the problem. I'm not keen on downgrading the AE so am instead thinking of buying a new wired modem/router (contemplating Netgear DG834).
Have you heard of the alledged compatibility problems between AE and D-Link 300T and the suggested "downgrade fix"? Would you have any views on whether the Neatgear DG834 works well with Apple kit?
Kind regards
LS

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