When I try to capture a video into the imagemixer software, it says it does not recognize the camcorder.

Lets see if it's a software issue or not.try to use windows moviemaker as your video capturing software instead of imagemixer. if issue is with imagemixer alone, you may want to uninstall and reinstall and update the software.check website for update: http://support.d-imaging.sony.co.jp/www/disoft/int/pixela/imx/dl/index.html and download the free update for imagemixer ver.1.5 for sony.
if still it's not recognize we can isolate the issue with the camera or connection. if your using usb,make sure you have the usb driver installed properly.you can download the device driver at this website: http://esupport.sony.com/US/perl/swu-list.pl?mdl=DCRTRV350 and make sure you don't have the camcorder connected during the installation.also have the usb stream setting (under setup menu) set to on (see:p.221 of your manual). after that the camcorder should be recognized. if your link connection (ieee1394 or dv) it should be a plug-and-play connection. better check computer connections and connected device in device manager screen to see if the cam is listed as an unknown device.if it does, you can be sure nothing is wrong with the usb cable. it can be a connection.issue.try diff ports if available (usb back port at the back is recommended for use, that is directly connected to the motherboard) and check. if the cam doesn't show or you don't have any indication that it's connected.try using a diff usb cable.if still doesn't try using a diff compatible PC.use same procedure.if' it's still the same, unit may require service.hope this helps.thanks:)