Well I have no such problems with XP, so it may be that the older Nero 7 is just not a good choice for VISTA 64.
I have had several issues with keeping differents burning engine on my computer,
Usually the problems I see come from having various burning/converting suites. ImgBurn is not bloatware, does not install a bunch of often proprietary codecs (among other things) on your system. I can't recall a case where someone had conflicts with other apps after installing ImgBurn.