To: map929
As you are using a 64-bit system, please place the .dll following 
C:\Windows\SysWOW64.
| map929: | 
| I really love the apps but when I convert a large file it finishes in a second and never really converted..... | 
 Could you please open the source file in the program once again, choose the preset, then click on Advanced > File Information and attach a screenshot of this window.
Hope to hear from you soon