Wireless mac spoofing not working

So heres the deal my parents think im on the computer to much and so they cut me from the internet at certain times of the day, the thing is is that they only blocked my mac address so all i have to do is spoof it and im back online. Well this is working great when im plugged in with ethernet cable i just change my mac address in the settings, BUT that only limits me to my room where i have a ethernet switch. So i said ok ill just change my wireless mac but when i change "Locally administered mac address" in the wireless settings it doesnt do anything, i check with ipconfig /all and it stays the same, i've tried almost anything and every software. Is there sumthing else i have to do?

My specs

-Dell xps m1530

-Vista home prem sp1 64bit