Thx for your suggestions guys. let me tell you that first of all i did try out the command without the START command in the begining and guess what it showed, insufficient disk space!!
The funny thing is that my whole compilation totaled around 4.23 GB and the hard FREE drive space i had was around 25GB+. it said it required around 48GB free disk space.. isnt that weird?
anyways, i had included my 5-in1 Off2k3 .iso file in my compilation just to back it up on the dvd. when i remove the off2k3 iso it worked fine but if i add it to my collection it never works..
i have successfully made the ultimate dvd and am happy with it now.