Unable to connect to wireless network

Hi,

This is a problem concerning my wireless connection. Some time ago, I had no
problems connecting to my wireless connection using WEP encryption. However,
I tried to change the encryption to WAP on my gateway page and thereafter
failed to connect to the internet. Using a LAN cable to connect to the
internet, I reset the encryption back to WEP. However, although my other
computer which is also on connected via wireless managed to reinstate its
connection, the computer on which I changed the encryption to WAP could not
connect to the internet, showing "limited or no connectivity". This is the
results of the ipconfig /all command:

Ethernet adapter Wireless Network Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : D-Link AirPlus Xtreme G DWL-G132
Wir
eless USB Adapter(rev.A)
Physical Address. . . . . . . . . : 00-17-9A-BF-32-E5
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IP Address. . . : 169.254.203.251
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

As you can see, the IP address is not of the "192.x.x.x" suffix, although
DHCP is enabled. The router gateway page also shows that DHCP is enabled for
the computer.

I tried removing the wireless network which i used to connect to and adding
it again, but it prompted me saying that the network password had to be 5
ascii characters. I set them to an arbitrary 5 characters, clicked 'ok', then
went to reconfigure the connection again. This time, the network password
showed to correct amount of characters that my connection used to have.

I tried setting a static IP with a "192.x.x.x" suffix, but although it
showed that I could connect to the internet, I was unable to view any
webpages. This was because the DHCP was "off" as revealed by the "ipconfig
/all" command.

Powercycling the router and the computer has no effect. The computer can
connect if it uses a lan cable. DHCP works while using a lan cable.

Thanks for your help