I've created a simple video showing these steps here.
Open Windows Explorer
- Locate the drive representing your camcorder. On my PC, it appears as drive I (I've got a bunch of drives)
- Drill down to this path: I:\AVCHD\BDMV\STREAM (the first drive letter will probably be different on your PC - see step 2)
- Copy the files to the clip board if you want to leave them on your camcorder or cut them if you want to move them
- Navigate to whereever you want to store videos on you computer and paste them.