RT61 Wireless Card Configuration

Hi people! I am here again to bring to you a new problem.
I have recently installed a D-Link AirPlus G DWL-G510 wireless card, and I have followed the following steps:
1- uninstalled network-manager
2- removed rt61pci module that was currently inserted into the kernel
3- compiled the rt61cvs driver
4- installed the driver with make install
5- copied the "firmware" files to /etc/Wireless/RT61STA
6- rebooted
7- configured the interface with Yast2
8- rebooted again

After all this, nothing works. I ping my wireless router and no reponse. Ping returns "Host is unreachable".

When I execute the ifconfig command it returns me this info of wlan0:
Code:

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wlan0    Link encap:Ethernet  HWaddr 00:19:5B:EC:03:D5
inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:204 errors:0 dropped:0 overruns:0 frame:0
TX packets:2146 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17928 (17.5 Kb)  TX bytes:0 (0.0 b)        Interrupt:18

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And iwconfig returns the following:
Code:

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wlan0    RT61 Wireless  ESSID:"linksys"  Nickname:"linux-amd"
Mode:Managed  Frequency:2.412 GHz  Bit Rate=54 Mb/s
         
RTS thr:off  Fragment thr:off
          Encryption key:off
Link Quality=0/100  Signal level:-121 dBm  Noise level:-79 dBm
Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
Tx excessive retries:0  Invalid misc:0  Missed beacon:0

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What I see here is that "Link Quality" is 0. I also have Windows XP installed and my network functions properly with the same network values (ip addr, net mask, gateway).

Does anyone know what could it be the problem?? If anyone needs more information about the situation, don't hesitate to ask.

Thanks in advance!