Hi there
It is likely that there was and is a program already on your new pc that uses the webcam and that this program needs to be activated for the first time in order for your computer to fully recognise the webcam.
Check start menu, control panel, programs, programs and features:
here there will be displayed a list of all the programs that are on your computer. Check through these to see if there is a program that relates to the webcam (You cannot run the program from here).
Once located click your start orb and type the name of the program into the search programs and files area. The program should come up in the start menu list. activate it and follow the setup instructions.
Note: if the webcam is not visible in the device manager there is no driver installed on your computer to run the device or your device is faulty.
To veiw the device manager Click start, control panel, system and security, system and then click device manager in the top left corner of the window. your webcam should be listed under the imaging devices tab. click to extend the tab. Is your device listed here?.
If your device is listed double click on it a window will appear. The General tab should indicate that the device is working properly lets disreguard this for now and try updating the driver
click the Driver tab then click update driver.
Once your webcam has been activated for the first time you should able to use it in any program that supports a webcam.