That's what we do here, help out, whether you have contributed or not. We love helping out, so welcome and don't sweat, we'll have back up in no time, well I little time, well about 40 minutes, but you get the idea
Seeing that you cousin has already wiped it, you just need to reconnect you device to your computer and run the loader.exe file located in c:\program files\common files\research in motion\apploader\ that will then connect to your device and begin the reinstallation process.
Got any other issues, just let us know.
We're here to help.