cant find wireless network D-link G604T

Ok im using a d-link G604T wireless router. I have my computer connected to the router via cat 5 cable. A few days back i had the wireless networking working, and my lapto was able to pick up the network, i even was able to pass a few files across the network (this was before dsl was enabled on my phone line). But just this morning i setup my modem using xtra telecoms setup cd and now my laptop (wifi enabled) cant even locate that there is any network present. I was previously using wep encryption and tried taking it off to see if that would work, but no luck. Its so frustrating because i had it working and now its not working even though ive tried reseting the modem to default settings and setting up everything manually all over again.
If anyone could help it would be great.
Thanks.