Hi ChelseaCarr,
Error: This hardware device is not connected to the computer (Code 45) will occur if hardware device is not properly connected to the computer. The only solution is reconnecting the device (web camera) to the respective port.
As the web camera failed to detect when you scan for the hardware, there is a chance that
web camera was disconnected from its motherboard port. I would suggest you to contact Dell support and ask for their help.
http://www.dell.com/support/my-support/us/en/04?c=&l=&s=bsd
For your reference:
http://technet.microsoft.com/en-us/library/cc770855(v=ws.10).aspx
Hope the information provided is useful.