hi guys,
i need some help,
whenever i partition my disc c which is 80gb with 30gb free using the own vista application in "computer management."

i must first shrink the partrition,after i do that i get a maximum choice of shrink size is something around 15gb.whatever size i choose i always end up with an error saying:

"there is not enough space available on the disc(s) to complete this operation"
whats the problem,i have 30gb free maybe more and it doenst work,i remember it was possible on this computer because when i bought it it had 2 partritions on it already,so why cant i do it now?

thx,pls help,i want to install xp and keep vista

get mcrobbie to hit the back of the pc with his hammer, tell him its my pc

any help?
thx

k,i tried to do a 1000mb partition an it worked,anything bigger wont,wats the problem,i have 30gb free?thx