Finally after weeks of trying to figure out what went wrong... I got my WiLAN working at home! Hehehe! Just had to install the latest firmware for my router. My friend adviced me to do this before but I didn't! Makulit kasi ako!
Well here's what I did:
1. Reinstalled Ubuntu
2. Downloaded the firmware update for my Linksys router at www.linksys.com/sg
3. Setup WEP
I'm so happy!