We have Handycam HDR-HC3. Our old PC worked well importing videos, but eventually died, and we upgraded, but didn't check new pc didn't have Firewire. We have a spare Vista PC which has Firewire socket, but it doesn't work when we connect Handycam (ie the Windows Movie Maker doesn't load automatically when cord attached, instead it just does a beep). We asked local Sony shop, and they said to download firewire drivers for HDR-HC3, so I googled "firewire drivers vista" and found you. How do I know which software will correct the problem, and if it doesn't can I get a refund?

Http://forum.videohelp.com/threads/260169-Sony-HDR-HC3-driver-issue

I searched under HDR-HC3 firewire driver and got the above link.

It says the following:

Hi..

The problem was a missing MSDV.SYS file.

Thanks
D.
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Actually, on the Sony site it says that no additional drivers are required to connect the camera in Windows XP, Vista, or 7.

But, the user of this camera and firewire noted that he was having trouble convincing windows of this.
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Another link that talks about the firewire problem follows:

http://www.avforums.com/forums/camcorders-video-editing/480748-cant-copy-video-pc-sony-hdr-hc3.html
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You can find more links by searching under 'HDR-HC3 firewire driver' or related searches to find the solution to your problem.

I hope this helps.