Go to the main site and determine if you need to update your BIOS. ASUS - G53SX
First Right click on Computer and select properties. Then select Device Manager and see if there is an exclamation mark by the webcam or any other devices. Note it and right click on one and you can select properties and update drives to see if that helps, or uninstall it there and at the top, Scan for hardware and see if it picks up.
Then if that doesn't work, update your BIOS and redo the steps above.
If you check on the Root of C:, maybe you will see a folder labeled drivers or ASUS and see if you see drivers located there.