Can't Get Fallout 3 to install

I've surfed the net and found many vista users with the same issue
unfortunately no working solutions out there for most of us. I get
message during setup (usually right around MenuVoices.bsa) saying

C:\Program Files (x86)\Bethesda Softworks\Fallout 3\Data\Fallout
MenuVoices.bsa doesn't match the file in setup's.cab file. The mediu
from which you are running the setup may be corrupted; contact you
software vendor

I get a catastrophic failure if I click "Retry" and setup closes. Ever
subsequent file gives the same error message if I click "Ignore" an
setup fails. Any ideas???

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CombatComProg