Windows 7 32bit
Premiere Pro CS4

Guys i am working with some AVCHD footage , which is a bout 6 mins long
I added some effects and transitions to the clip and exported to Media Encoder for rendering , I wanted the final out put to be in HD as well , so I selected H264 and YouTube 16;9 Preset

It took Almost 18 hours to render and finally when I watched the video , its out of sync with music.
Is there any way to convert AVCHD footage to HD footage and work from there ?
Maybe that would be easier to work with ?