It might not be getting power to the servo-mechanism, or it might be fried. Anyway, it sounds like a hardware problem. Swap it out and see what happens.
A friend of mine worked IT at a local University here and he actually got this call: “Um, my computer is not working. Even the coffee cup holder won’t come out!” She was serious…
Sounds like you’ve downloaded the corrupt update. If you look on my computer does your cd drive show? If not I will post the fix once I have cut and pasted it to the next answer!
Hit start and type regedit in the seach bar. Select local machine then system, then current control set, then control, then class, then select the set that starts 4D36E965. Once in there delete the upper and lower filters. Restart your machine and it should work fine :-)