On Windows NT, 2000, XP and 2003:

• Go to Control Panel and open the System icon (Start -> Settings -> Control Panel -> System, or just Start -> Control Panel -> System for Windows XP/2003) OR right-click on My Computer and then choose Properties.
• Go to the Advanced tab
• Click on the 'Environment Variables' button
• Look into the 'System Variables' pane
• Find the Path entry (you may need to scroll to find it)
• Double click on the Path entry
• Go to the end of the current entries
• Enter the path to your directory at the end (*Note; Be sure to add a ; (semicolon) at the end of the previous entry to separate it from what you are typing.

C:\Program Files\MySQL Server 5.0\bin

(For MySQL 5 the bin folder is where the mysql.exe resides.)

• Press OK and restart your computer

On Windows 98/Me

On Windows 98/Me you need to edit the autoexec.bat file:

• Open the Notepad (Start -> Run and enter notepad)
• Open the C:\autoexec.bat file
• Locate the line with PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;..... and add: ;C:\php to the end of the line
• Save the file and restart your computer

Note: Be sure to reboot after following the steps above to ensure that the PATH changes are applied.