I downloaded 5.5 for use under Vista and Windows 7, and found that only the instance configurator worked. From the command line there was no way to run "mysql.exe"; there was simply no authorization for any user to run. Often a complaint appeared that "authentication_string" had no default value.

I therefore downloaded and installed 5.1.


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> From the command line there was no way to run "mysql.exe"

I may be dwelling on the obvious, but have you checked the "place MySQL
system libraries in the system path" (or something similar) checkbox on
install? v5.5.9 runs fine with me on Win7.

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