You must not install 5.0 over 4.1, put it somewhere else.
Also, instead of naming the service "MySQL" both times, call it something else (i.e. "MySQL41" and "MySQL50"). If you use the Windows installer distribution, it is one of the options; if you are doing it by hand then you already know how to name the services whatever you like.
HTH. Octavian Rasnita wrote:
Hi, Is it possible to install 2 versions of MySQL on the same computer? I want to have MySQL 4.1 and 5.0 installed, and use only one of them at a time. I have installed MySQL 5.0 over MySQL 4.1 and now MySQL 5 works fine, however, I cannot start MySQL 4.1 although I have stopped MySQL 5 first. When I try to: net start mysql (where "mysql" is the name of MySQL 4.1 service) or tried to start the service from the Windows management console (Services), the following error appears: Could not start the MySQL service on Local Computer. Error 1067: The process terminated unexpectedly. Thank you. Teddy
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