Lenovo ThinkPad R61 Hardware Maintenance Manual page 226

Windows Vista Home Premium (32 bit) DVDs for R61i (some
models)
Windows Vista Home Premium (32 bit) is preinstalled as the operating system in
the following models:
v 8914-CTO
v 8918-CTO, ARx, ASx, ATx, CGx, CJx, CKx, CLx, DAx, DCx, DPx
v 8919-CTO
v 8920-CTO
v 8927-CTO
v 8928-CTO
v 8929-CTO
v 8930-CTO
v 8932-CTO, E4x, GBx, GFx
v 8933-CTO
v 8934-CTO
v 8935-CTO
v 8936-CTO
v 8937-CTO
v 7649-CTO
v 7650-CTO, A6x, A7x, A8x, A9x, CBx, CCx, D2x, D3x, E6x
v 7657-CTO
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ThinkPad R61, R61e, and R61i (15.4-inch widescreen) Hardware Maintenance Manual