I'm not sure if W7 always installd directX drivers, but if not the you'll have to do it manually. I'm on XP so I always install directX after clean install of the OS and the video drivers.
if it's not that then the game you're trying to run actually requires you to have ATI/nVidia GPU.
T61: 14.1" 1400x1050, T9500 @ 2.8GHz, 4GB RAM CL4, nVidia 140m @ 600/925 MHz, Samsung 830 256GB, DVD-rec, 5300agn, FP, BT, 6-cell, clean XP Pro
T61: 14.1"w 1280x800, T9500 @ 2.8GHz, 4GB RAM CL4, Intel X3100, Samsung 830 256GB, DVD-rec, 4965agn, 4-cell, clean XP Pro