OK a quick re-cap.
You have uninstalled and re-installed MF4.
You have applied all of the updates including
http://ftp.ulead.com/pub/Updates/dmf4/dmf4_up4_e.exe
Which addresses a problem with Pioneer DVD writing devices.
You have disabled any packet writing software on your computer.
You are able to create Video_TS and Audio_TS folders
to your hard drive then burn with another product.
1. Do you have sufficient RAM installed on your computer?
2. Have you installed the latest firmware for your writer?
http://wwwbsc.pioneer.co.jp/product-e/i ... 01r_e.html
Failing all that I would just take the easy option and burn to a Hard Drive folder and burn with your other product.
Regards
Steve J