If you have not uninstalled the older drivers
for the 3400 series card you might be having a conflict., And since your original card is integrated, did you disable it in the bios? Also, as easy as a manufacture may tout that you can successfully uninstall all of their drivers. there are always bits left over. I recommend to use Driver Sweeper
, it will grab all of the leftover bits after you have uninstalled the traditional way.