You can start by checking the MySQL error log: http://dev.mysql.com/doc/refman/5.0/en/windows-troubleshooting.html
The error log is located in the data directory specified in your my.ini file. The default data directory location is C:\Program Files\MySQL\MySQL Server 5.0\data.
Once you have the error.log, if you still need help paste here the content. Bye.
cereal
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