Handy Cam to Vista Movie Maker

This may already be on here
Hi all, cannot answer your question as I have one of my own with similar probs.

I have a Sony Handycam DCR-DVD106E, 1 year old. I have a fairly new version of Vista Movie Maker, 1 year old, but when I try and download videos from the Handy cam the reply is “Import Video coiuld not find a suitable digital video device”.
Also when I download from the handycam using another video browser and import into Movie Maker I get the picture but no sound, any ideas?