Please help me: I'm lost

HI, Im newby for somes hours on this forum. Due to my lack of my english, I need your help. I download last night blender v2.49b on I choose win 32, but there are 2 bundles side by side win32 and .winrar. I downloaded both of them ( Just in cas of). My question is: Do I need both of them? ( the first one is the complement of the second?) If yes witch one must I install first? I’m running on Intel p4 ht 3 ghz, window xp pro and a brand new geforce 9800 gt. Do I need to add an open gl software? ( My video card has nvidia an open gl)