Dlink sucks! Return it!
You probably have DI-624? Tell me about it! Return it and buy Linksys one.
Also, Linksys router is open source. You can download third party shareware to increase the power by 300% and use WDS to link multiple router together.
Go to www.linksysinfo.com download section and download sveasoft shareware for Linksys WRT54G and WRT54GS.