I was able to use a dell oem cd of vista basic to reinstall windows on a compaq pc. The backup cd's I created wouldn't work on the ecs board I installed, so I used my dell vista cd to reinstall vista. I was able to re-activate windows online with the original coa sticker number on the side of the compaq case. Those numbers are hard to read, even with a flashlight. Dell oem cd's for vista and xp are available online for around $17, last time I checked. Yeah, I think it's a total ripoff to force you to use another compaq motherboard just to use your vista license. The cost of the board doesn't justify it. I gave up my compaq warranty; I've changed out the motherboard, power supply, and added memory to the new board; the old board still works fine, but I wanted 4 dimm slots, and hp (which owns compaq) wouldn't sell me another hp board no matter what I paid them. They stated to me it's not their policy to sell geniune hp parts unless they install them. The cost was more than what I paid for the whole pc.