I recently bought a Liteon 8x external slim DVD writer.
After I installed the Nero 7 essentials software disc,
I was prompted to reboot my computer.
After a reboot, my computer got stuck, (black screen),
I had to forced a shut-down and another reboot.
My computer then said it was having problems with the start up program and wanted to uninstall any recent items in a clean up systems procedure.
It uninstalled the Nero 7 during the clean up process, and my computer started up again fine.
the second time I installed, same problem so I had my computer just run diagnostic and not run an uninstall clean up program. This didn't work so had to run a clean up program again, returning to a prior time before problem occurred. (which uninstalled Nero 7 essentials again)
I did some further research and found that nearly all the external DVD burners come with a Nero software suite.
My computer is a 1501 Dell from May '07, running on Vista. I do not know why it is having problems with the Nero software.