Limited or No Connectivity + Can't renew my IP address = No wireless...

I have MN-500 Router and a Wireless G Card on my laptop.

I recently re-installed windows XP (SP2 problems) and
successfully put SP2 back on. I can get online
(obviously) with my cat5 cable connection. However when I
try to go wireless, my connection status says it is
limited or no connectivity.

So, I try to repair the problem, but it won't finish
because it can't renew my IP address. My signal strength
is excellent.

I have installed a SP2 update (WindowsXP-KB884020-x86-
enu) and added some code to the registry...as other
people/websites have said this might fix it, but to no
avail.

Can anybody help me..?


Thanks.