Sorry you had to wait.
Trying another keyboard normally solves this.
Startup Repair should offer to System Restore to before the install which should resolve it. If not let us know.
If the webcam prob persists just don't install it's bloatware package which only allows you to look at yourself on your own computer. Only take the driver
Windows 7 delivers when you plug it in or shortly thereafter via Optional Updates when you Automatically get recommended drivers and updates for your hardware
Then use the webcam with the actual program that you need it for, e.g. Yahoo, Facebook, Live Messenger, etc.