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ERR 01 is a lens communication error. Try cleaning the contacts on the lens and in the mirror box.
ERR 05 is a flash error. It is usually caused because the flash failed to pop up. This can be casued by something as simple as the flash hitting the brim of a 'gimme' cap or impact to the flash or most likely spillage of sticky liquid around the flash and its pivots.
The XT also is notorious for having the bottom right screw of the rear circuit board come loose and short out some function of the camera, or even blow the main fuse or damage the circuit boards.
If following the instructions given with the error message doesn't solve the problem, you need to contact your nearest Canon service center. You can go here, select your portion of the world, and go from there.
CF stands for compact flash which means you have an error with your memory card. Try removing and replacing your compact flash memory card. If that doesn't work you may need to format your memory card or replace it.
Error 99 is a "catch all" error that has several causes. It could be that your battery is not fully charged, especially if it is a generic, non-Canon battery. Charge for at least over night even if the charger says it's full. If that's not the cause, switches inside the camera will have to be cleaned by a repair shop.