Error 99 is a result of an electronic communication problem normally between the lens and the camera body.
Use a red pencil eraser to "polish" the contacts even if they look clean do it again.
Take care to keep dirt out of the camera and lens bodies.
Another thing is often times the camera firmware needs to be updated to move on from this.
Another thing is the CF cards? The 20D was in an era where pretty well the larges CF card was a 2gig,I use several 1gig however if you have updated your cards to say an 8gig the firmware just can't handle the card.
Okay moving on clean the lens and body, update firmware, make sure the CF card isn't beyond the camera capabilities and last if all that stuff didn't work the it's possible the actual sensor is really dirty and needs cleaning.
The worst case scenario is that the shutter has failed. The Canon 20D is only good for 60,000 actuation's.
Hope this give you a few options
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