Mga bro, any networking guru out there who can help please

??
i bought a wireless 4-port router from CDR-King that P1,380 kind and i cannot connect my desktop to the internet anymore. My set-up is this: i'm connected via Globelines broadband using DSL connection (RJ11) and from my broadband modem (Speedplus 511e) using RJ45 to the wireless router then onto my PC desktop.
Im using dual OS, both Vista Home premium and XP SP2, and need to have the wireless network working for both OS.
managed once on both OS magka- internet connection using the ipconfig of my desktop but upon rebooting the whole thing wont work again. same also with the XP.
Can anybody help me out on this please. my contact numbers are 4149578 or 09208140716 or 09065336171 or 09225503594.