I have a 160 GB hard drive in my computer. I am using windows xp with 1 gig of ram and c2d processor. I have partition of 4 partitions of 40gb each. I want to merge the last two partition and create a 80 GB single partition out of it. I want to know how can I do this without using the windows bootable disk. I need some free software's which are enough reliable who can merge and create partition without damaging the disc. Thanks in advance.