Itunes will not install..windows INSTALLER service not available.windows 7

I am trying to find a fix for this...just bought a new computer with windows 7, all updates have been performed. Itunes will not install...it just stops and says "windows installer service not available" Can't find a stand alone downloadable version of installer 5.0 which is what comes with 7 from the research I have done. I have the newest version of itunes saved on desktop, tried running it from desktop, tried running as admin, tried several other ideas that I found on here and Microsoft..but nothing is working. Any advice?
Message was edited by: ehindahl

Same error message "This version is for a 32 bit computer, yours is a 64 bit!"
Doublechecking ... by any chance did you migrate a 32-bit version of the iTunes, Apple Mobile Device Support and Bonjour programs to the 64-bit machine from a 32-bit machine using the PC Mover utility?
(Your symptoms are consistent with that ... the installer service throws the message when trying to uninstall the 32-bit itunes and related 32-bit componentry prior to installing the new 64-bit versions.)

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