Lenovo ThinkPad R61 Hardware Maintenance Manual page 224

Windows Vista Home Premium (32 bit) DVDs for R61, R61e, and
R61i (some models)
Windows Vista Home Premium (32 bit) is preinstalled as the operating system in
the following models:
v 7642-CTO, 25x, 26x, 27x, 28x, 2Cx, 2Dx, 2Ex, 2Gx
v 7643-CTO, 3Hx, 3Jx, 3Mx, 3Nx
v 7644-CTO, 48x, 4Ax, 4Lx, 4Mx, 4Nx, 4Rx, 4Sx, 7Kx, 7Lx, 7Mx, 7Qx, 7Rx
v 7645-CTO, 5Bx, 5Cx, 5Dx, 5Gx, 5Hx
v 7646-CTO
v 7647-CTO
v 7648-CTO
v 8914-CTO, 3Sx, 3Tx, A6x
v 8918-CTO, 5Fx, 5Hx, 5Rx, ACx
v 8919-CTO, 6Sx
v 8920-CTO
v 8927-CTO
v 8928-CTO
v 8929-CTO
v 8930-CTO, 3Yx, 42x, 43x, ECx
v 8932-CTO, 9Ux, AFx, ELx, EMx
v 8933-CTO, 73x, 75x
v 8934-CTO
v 8935-CTO
v 8936-CTO
v 8937-CTO
v 7649-CTO, 4Cx, 4Gx
v 7650-CTO, 6Dx, 88x, DDx
v 7657-CTO, 6Px, 6Rx, 7Mx, 7Rx, C3x, C7x
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ThinkPad R61, R61e, and R61i (15.4-inch widescreen) Hardware Maintenance Manual