removing xp after installing win 2003

hi all
i am havin a weard pblm. i have win 2003 4 in 1 cd(all win2003 edition in one cd). with that i installd win2003 server in my comp. i already had winxp. so later i wanted to remove xp frm my comp. but its showins cant b format c:/(winxp is inc:/ and win2003 in d:/). later i try installin installin won2003 in same c:/ by formating c:/ during installatoin. that tim also i gt the same pblm.
if i try to instal a fresh copy of win2003 in dos prompt like
a:/>setup.exe
its showing like scant run setup.exe in dos primpt as its an autorun in gui. andi cant write the dc also for win2003 4 in 1 coz the iso file is 850MB. after extracting ins showin 1.94gb. so its neither cd version or DVD verson.
pzl help

Microsoft doesn't offer a "4 in 1" ISO for Windows Server 2003. Sorry, but buy the real thing and you should clear up the bulk of your problems. In fact the only site I could find a copy of it was a Chinese site. What does that tell ya?

//locked.