1067 error on attempt to start MySQL

The solution to the problem for me was looking in my install directory, finding the /data folder, and copying it's content to the data folder that was specified in my .ini/.cnf configuration file.

The solution was to install MySQL without spaces in installation path. Windows 7, 64-bit

One more thing that prevents the mysqld windows service from running is if you have mysqld.exe already running (but not as a service) and occupying port 3306. When the service tries to start and sees that port 3306 is already taken, it fails.

Just open up the windows task manager and look for "mysqld.exe" under the Processes tab. If you see it, kill it and then try to start the service again.

c:\> net start [servicename]

example: c:\> net start MySQL