Did anything change in your laptop - any software/hardware changes.
There must be something that changed as your webcam was working fine before.
Try System Restore - Restore your system to a date when your Webcam was working fine.
A couple things to try:
1) Apply all Microsoft Updates
2) Apply the latest BIOS if newer than yours (for your EXACT laptop)
3) reinstall any drivers and software related to the webcam (it won't cause problems if the same version is already installed. Sometimes installing a driver or software will uninstall that software. If so, continue and remove then run once more to Install it.)
4) Install other driver if newer, especially:
a) main chipset driver
b) video driver
- You must use drivers and software for your EXACT laptop.
- Try at least two versions of software to view your webcam (Messenger, Skype etc.)
- Open Device Manager and look for conflicts.
- If in dire straights, burn Ubuntu to a CD or DVD and run it to see if the webcam works (You must have your BIOS set to boot the DVD drive before the hard drive.) I'm not certain if most webcams would show up right away. You can update even running from DVD but all changes are lost once you shut down or reboot.
Recommended boot order for computers is:
3) hard drive
(This means the computer will first check USB to see if any mounted devices contain a bootable image such as Memtest, Linux or backup software like Acronis True Image. It then repeats for the DVD drive if nothing is found on USB. It then boots to the hard drive, usually Windows, if nothing is found.)