I am trying to use Pinnacle Studio Ultimate v 11 and find that the playback of AVCHD is jerky in the editing view. My equipment is as follows

OS -Vista 32 bit
Processor - Intel E6320 core duo (1.7 Ghz)
Mainboard - Intel DG33FB
Video Card - ATI Radeon 4350 (512 Mb memory)
RAM - 2 Gb
HDD - WD Caviar 500 Gb

Any suggestions?