Compatibility of burners (for DJ)? I think itz the PC instead...

[lcomplex]

Okay, here's the case, I have heard you people keep saying that DJ doesn't work because the bunrer and the program don't go along together, but it happens to me that---my friend and I both have a same burner, but DJ works on his computer and mine doesn't work (we are using the same version of DJ)
Can anyone tell me why? Does anyone know how to make DJ works on a computer (Could it be the invalid serial key we enter while we are registering the product, etc?

A lot of people would like to know the fact, so EXPERTS, come help us!