Help please! TOMI Launch keeps freezing

dc1606

Have just started episode 1. Unfortunately the game keeps freezing in the dock area. The cursor moves about once a minute, possibly as delayed reaction to moving mouse , music continues all the time. Jungle scenes OK so far though. Have tried re downloading and reducing resolution to 800 x 600 and quality to 5 but no change. Have Vista business and Radeon X1300PRO. Have updated DirectX when I downloaded .Any suggestions?
Thanks,
Dave