How to copy system file from cd or usb hdd to C: drive whe..

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Hello Folks.
I think I got carried away removing files via Spybot S+D ...
Computer with xp pro won't boot after cleanup with spybot .. cleaned
lots of Green coloured files found by spybot.
...Now get message " windows\ ...\ system file is missing or
corrupted "
I have a copy of that file on a Ghost image disk ( the whole image
also is somewhat corrupted + can't be reloaded ] but the system file
is retrievable + now copied to a cd disk.
QUESTION: How can I copy the missing/corrupted system file from a cd
to the c: hdd if windows won't boot ??
I don't have the original XP cd.
I have the " Ultimate Boot Disk cd " via PC World site link, but I
can't figure out how to replace that file from a cd.
Any help gratefully rec'd. Please post to NG. Thanks, -JS