Problems with WRT54 V.7 (V7.00.4) :please help me!...

Hi,
I've just installed (two days ago) this device and it's so annoying.i've been with the chat support of linksys for hours and they could not help!
These are the problems:
My laptop "see" the router but u can't access the internet,although that when i try to check and connect the laptop via direct cable it's doing that with no problem.
U can see that the signal is strong but u just cannot access the net.
My second device:an asus a636 pocket pc can see the router only on a few times:most of the time i just can't "See" the router,and when it does see it sometime,u cannot surf the internet as well.
(i must point out that i surf the internet using th pocket pc with no problem on many public places...)
I tried to restart,reinstalling the firmware (v7.00.4) a few times,and configured the router again,but it didn't solve anything.
To add to that:the setup cd/wizard didn't work at all and started the debugger of the windows (Win2000),and even when u try to download the setup from linksys site,it's doing the same and starting the debugger,so i installed the 7.00.4 firmware using the tftp.exe program.
What else can i do so this device can work properly??it's so frustrating!!!
Please help whoever u are.
Thanks in advance!!!

Hi… Try changing the Wireless Channel on this router and check the Wireless Security mode. Make sure it is supported by your OS / wireless adapter. Select proper security key and try to connect to this wireless network. Once connected, check the IP address on the PC and try to ping to Router and DNS servers. Revert back with your findings.

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