"The disc can’t be burned because because communication between the computer and the disc drive failed (error code 0x80020022"
I see many similar problems addressed throughout discussion groups and forums. I've repaired permissions, repaired the disk, checked firmware ugrades and reset PRAM. Are there no hardware diagnostics. The Macbook is fine and reads DVDs fine. Writing is the only issue and that started after using iDVD.
If you're running Snow Leopard, you can just reinstall the OS. The Snow Leopard installer won't touch your data. Erasing the drive is always an option, though you'll want toake sure your backup is current.