Software problem

i have windows xp running and a yamaha writer 8424 ide
my problem is that i downloaded nero 5.5.5.1 off the net and downloaded a key generator. i opened up the key generator and it asked me to generate a code.
the options that i were given were bundled , bunled with writer ,oem ,normal or demo what do i choose.i choose demo and when tried to burn cd it crashed halfway through burning cd and it came up with a blue screen.please help:Z

try normal
it worked 4 me