I found this information on my TechNet CD. Let me know if it helps:
Source file is unreadable. This problem is probably due to drive
S
Source file is unreadable. This problem is probably due to drive
hardware problems, corrupt files or disks, or, if you are setting
up from a network, network problems. Setup error 214 can also be
caused by incorrect CMOS settings for floppy drives or third party
extended memory managers.