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Hi Daniel, I can imagine the inconvenience you have experienced. I will definitely help you in fixing the issue. To help you suggest more steps to resolve the issue, I would appreciate if you could answer the following questions:. Do you receive any error code or message? Please follow the below methods and check the issue: Method 1: I would suggest you to remove all the external devices except keyboard, mouse and Logitech Quickcam 8.4.8 and check the issue.
Check whether Logitech Quickcam 8.4.8 is Compatible in Windows 7 from the below link: Windows Compatibility Center: Open Device Manager and right click on Windows and click on Scan for Hardware changes and check whether you are able to detect the Logitech Quickcam. Follow the steps in the below link.
Open Device Manager: Method 2: Follow the steps in the below link. Open the Hardware and Devices troubleshooter: I hope the above information helps you.