How to Re Partition your hard disk to install Linux on my laptop?

Hi , i have a fujitsu c2210 laptop. It came with windows xp installed on the c: and it has another d: that is fat32 and is just the backup disk of c: I want to install linux on the free space on drive c and therefore need to kno whow i can partition my hard sik using partiotion magic 8??? I do now want to loose windows xp or any of my current data. The total capacitu of my drive c is 54.4 gb out of which i have used 19.7 gb and 34.6 is still free. Also i have 480 mb of ram on my machine. I would like to create a partion of around 5 gb out of the now free space in drive c to install linux. How do i do this??