How to restore overwritten partion table?

[Alphonse Ogulla <aogulla@gmail.com>]

Hi good people,
A friend inadvertently made changes to his windoze disk (partition)
during initial install of woody but quit afterwards before permanently
writing changes to the partition table. However, the original OS can
now not boot at all. Error on start-up is "No operating system found".

How can I restore the original partition table so as to boot windoze
2000 and salvage whatever data he had on it?

There was only one partition on disk which had been taken entirely by
windoze. The partition was _not_ formatted after creation.

Shall appreciate whatever help you can provide,

Thanks in advance,

Alphonse,
Nairobi, Kenya.