If you are having a problem with another webcam, create a new thread. That's called threadjacking...and is usually frowned upon. You either need to find drivers for your cameras, or upgrade to ones with Windows 7 support.

As for the OP, my wife has a laptop form the dv4 series, and while I don't remember the specifics, Windows 7 has drivers for the camera. I just don't remember if they were built in to Windows 7, or if we got them from HP's website. It's been over a year since I installed Windows 7 on her laptop, and don't really remember.