i had exactly that on my win7 laptop
but when i realised the camera was an AV stream USB Video Class device i discovered we needed to install the UVC driver on win7
(it is installed by default on win8 and later)
after installing the microsoft UVC driver it worked fine on win7
“The USB Video Class (UVC) driver is a Microsoft-provided AVStream minidriver that provides driver support for USB Video Class devices.“
i was worried for half an hour, but after installing (and a full reboot) it has been faultless since.