Hi,
Thank you for posting in Microsoft Community.
I understand that Logitech C170 webcam is not working in Windows 7.
I can imagine the inconvenience you have experienced. I will certainly help you with this.
Logitech C170 webcam Drivers for win 7.
Refer to the link.
http://support.logitech.com/en_in/product/webcam-c170
You may try installing the driver in Windows 7 compatibility mode and check.
Method 1 : Try to fixing common driver problems
http://windows.microsoft.com/en-us/windows/tips-fixing-common-driver-problems#tips-fixing-common-driver-problems=windows-7
Method 2 : Try to reinstall the drivers
• Press Win + R Key > Run Box >Type devmgmt.msc
• In device manager > Under Imaging Devices > By right click to uninstall the Logitech driver.
• Now disconnect the webcam and reconnect again.
Method 3 :Update a driver for hardware that isn't working properly
http://windows.microsoft.com/en-us/windows/update-driver-hardware-isnt-working-properly#update-driver-hardware-isnt-working-properly=windows-7
Advanced PC users may be able to update Logitech Webcam drivers manually by searching for the correct version at the Logitech Webcam Driver Support ensuring that it matches the device type and exact model, downloading and installing it. Logitech quickcam pro camera drivers windows 7 free download - Logitech QuickCam Pro Camera Drivers, Logitech QuickCam Pro 5000, Logitech QuickCam Pro, and many more programs. Webcam windows 10.
Also Suggest you to install any pending Windows updates on the pc to check if that helps. Updates are additions to software that can help prevent or fix problems, improve how your computer works, or enhance your computing experience.
Aug 06, 2018 Logitech Webcam Software and Windows 7 Update Every time I do a new install with Windows 7 or Vista (x86 or x64), and then do the updates, the Logitech Webcam software fails install; it always fails and say that this software is not compatible with this version of Windows. Anderson October 24, 2009 at 15:28. Thank you so much Logitech for making Windows 7 64-bit drivers! I highly appreciate your work. I must say, the Logitech team is fast. Download and Update Logitech Webcams Drivers for your Windows XP, Vista, 7, 8 and Windows 10. Here you can download Logitech Webcams Drivers free and easy, just update your drivers now.
You may also want to update the MB chipset drivers from the oem website to check if that helps.
If still not work contact Logitech form support :
http://forums.logitech.com/
Logitech Webcam C170 Driver Windows 7
In your antivirus app, look for settings related to blocking access or permission to use your webcam. For help, visit your antivirus software company’s website.
Check for an outdated webcam driver
Select the Start button, type Device Manager, and then select Device Manager from the search results.
Find your webcam under Imaging devices or Sound, video and game controllers.
Press and hold (or right-click) the name of your webcam, and then select Properties.
Select the Driver tab, select the Driver Details button, and look for a file name that includes stream.sys. If it’s there, your webcam was designed before Windows 7 and you'll have to replace it with a newer webcam.
If you don't find a file name that includes stream.sys, try rolling back your webcam driver.
Roll back your webcam driver
In Device Manager, press and hold (or right-click) your webcam, and then select Properties.
Select the Driver tab, select Roll Back Driver, and then choose Yes. (Note that some drivers don’t provide a rollback option.)
After the rollback is complete, restart your PC, and then try opening the Camera app again.
If rolling back didn’t work or isn’t available, uninstall your webcam driver and scan for hardware changes.
Uninstall your webcam driver and scan for hardware changes
In Device Manager, press and hold (or right-click) your webcam, and then select Properties.
Select the Driver tab, select Uninstall > Delete the driver software for this device, and then select OK.
In Device Manager, on the Action menu, select Scan for hardware changes. Wait for it to scan and reinstall updated drivers, restart your PC, and then try opening the Camera app again.
If your webcam still doesn’t work, try looking for help on the webcam manufacturer’s website.