OK, so windows won't start...
Panic... A regular backup would have been a good idea, but since that ship has long since sailed I recomend a rescue disk.
If you can boot into DOS (either pressing F5 at startup or using a DOS diskette) then you can save all your work, providing it is all under 1.44MB
To do this you'll most likely only need to browse through directories..
cd [directory name]
cd .. (move up a directory
dir (list directory contents
copy [source] [destination] (copy files)
If this all seem like too much trouble, then you could use a liev linux CD.
Since the filesystem wil be FAT23 linux will have no problems reading it, download a live evaluation copy of suse linux from www.suse.com
you can boot off of it into a nice windows like environment within abuot ten minutes, it wil not affect our hard disc at all, and will let you brows through directories copying things to discette or CD...
you could try re-installing windows withoput formatting.
(then you wouldn't loose your work anyway)
if that doesn't work you'll have to format and start again.