its weird, i had the same problem few weeks ago. i clean installed windows 7 on my laptop and tried installing office 2010 but i got the same error. (it worked before i did clean install). SO, i clean installed one of my desktop using the SAME windows CD and MS office 2010. guess what, it worked! i dont know what the problem is on my laptop. its so random.. so i just installed office 2007 on my laptop..