Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I regret to have to report that there is no longer any downloadable software for the ZR series on Canon USA's website:
...meaning quite simply, that they no longer support it much, owing to its age probably.
You can call 1-800-OK-CANON and see if they still sell the disk, though.
Meanwhile, Windows 7 offers some facilities for handling and dealing with cameras and camcorders... provided that, when plugged in, your camcorder is recognized by Windows 7. Try it, wait a while, see if the screen at the lower right shows an automatic installing of drivers, then go to
Start - Computer
and see if there is an icon for the camcorder present there... if there is, double-click upon it and see what you get.
Please tell me what happens... and I may have further advice to offer. Thanks.