Unable to connect to wireless router

I have purchased a new wireless adsl router Aztech dsl605ew.
I tried to connect wifi with my vista dell laptop but message shown that: Windows cannot connect to xxx.
I used my other xp laptop to connect and I'm able to connect to the internet via wifi.
Any idea where's goes wrong?

Have you installed security on the wireless connection (Wep, wpa?) If so, might be worth changing to a different protocol (eg, if WEP use one of wpa protocols, if wpa, use wep or a different wpa. Also could try removing it altogether to see if that's causing issue).

Sometimes two wireless devices are just incompatible (so you basically have to replace one of them - eg, different router or different wireless card in the laptop - or could try a usb dongle to check) or vista might be causing the incompatibility. Does your vista laptop connect ok with other wireless networks? If you haven't tried it, best to before perhaps having the router replaced.

I have remove all security including wep or wpa and it seems doesn't make any differences.
I can connect to other wireless network using my vista laptop.
Any idea why it couldnt connect to my wifi router?

have you tried updating the routers firmware , its a longshot with it being new it shoud be compatiple but you never know

I have updated both my wifi card and router with the latest firmware but same problem

To my surprise....after setting to no security and setting back to WEP; it can be connected

Thanks for the help !