Gosh this error message drove me up the wall. I’m working in Visual Studio 2005 and for some reason my Setup.msi files when run are displaying the message “This installation package is not supported by this processor type.” Researching on the Internet tells me this error happens when your try to run the file on 64bit compile on 32bit or vise versa.

The problem for me was, I don’t have a 64bit computer or operating system, I’m just running good ole’ Windows XP Home edition.

Well I went up and down and all around looking for the answer to this problem. I checked my compile options for my primary output, I checked my setup deployment, I checked everything that I could think of. Then I went back and checked the setup deployment one more time and found a little drop down box that said TargetPlatform, and x64 was selected, so I changed it to x32 and everything seems fine.

I hate when something so stupid messes up the whole application. I’m sure I selected this by accident when changing some settings in my setup deployment.

So if you are creating a setup deployment and you get “This installation package is not supported by this processor type.” check the TargetPlatform option in your setup properties!