The Error Message

If you submit a PHP form which passes a large amount of data using the POST method, like a file upload form, it would be a good idea to increase the value of the PHP configuration variable post_max_size (you will find it in the php.ini file) if it seems like the script is running forever. [...]

I tried moving all my databases from MySQL 4.1 to MySQL 5.1 on Windows and since I had some InnoDB tables I could not just copy the data files between MySQL Server versions (from C:\Documents and Settings\All Users\Application Data\MySQL\MySQL 4.1\data\ to  C:\Documents and Settings\All Users\Application Data\MySQL\MySQL 5.1\data\). So, after I exported the data from the [...]