uugh after reading a fair few forums i think i now know what i have to do, or at least have a good idea of what i have to do.
i think these are my options
-take out the HDD, put it into another PC with sp1 and format it format it there using the various tools.
-replace my win xp "ultra edition"

with my win xp home edition and upgrade it to sp1 and try to do it from there, but i suspect it will only see it as 127 gig as its formated like that from the bios.
-get a smaller drive (like 10gig) with only OS stuff on it, and format the big one then...
-or probably the best/easiest solution, take it into a PC repair shop and ask them if they know any easy ways to fix it, with a bit of luck they will be able to do all the hard work for me hehehehe

so unless its some mobo thing which i doubt, then i will have to do some drive jugeling and try to format it some way, or let the shop guys do that for me and save me the bother of taring my other PC's apart...