Cant backup multisession backups

Hi ... Im trying to backup my backup of a dc game ... Ive used nero 5.5 before now and its worked fine on different games but with 18 wheeler it fails right at the end every time with different messages like buffer underun and cannot read last track .... so I used cdrwin4.0 and it wont even start burning and gives a message about not being able to burn multisessions... please help me...
If Im using the right software then please help with what I need to change in the config settings and if Im using the wrong software please explain where I can get whatever I need ... many thanks