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#11
First install EasyBC as per tutorial.
Depends on what you want to use it for,but seeing as you have near 500GB id give it 30GB.
Thats the link,heres a closer one Free Download Partition Wizard
Download the bottom one,the boot disc.Burn it at a slow speed.
Boot into PW,delete D,shrink C by 15, make new partition,mark as primary (click apply after EACH step,bottom left)
Boot the XP installation disc (should be burned at slow speed),install on D