Software for partition

Today i have formatted a HP system as windows xp . Iwant to install sql 2005 in it...
I installed windows installer as pre requiste ..After the installation of sql 2005 i want to give
a Back up...Now i have noticed that there is only one partition in the drive.I searched in the net and found the partition manager..........Downlaod from this link http://www.partition-tool.com/download.htm use home edition