In particolare guardando nei log :

090901 10:48:13 InnoDB: Starting shutdown...
090901 10:48:14 InnoDB: Shutdown completed; log sequence number 0 43655
090901 10:48:14 [Note] C:\Programmi\MySQL\MySQL Server 5.0\bin\mysqld-nt: Shutdown complete

InnoDB: Error: log file .\ib_logfile0 is of different size 0 10485760 bytes
InnoDB: than specified in the .cnf file 0 25165824 bytes!
090901 10:48:23 [ERROR] Default storage engine (InnoDB) is not available
090901 10:48:23 [ERROR] Aborting

Devo andare a modificare nel .cnf?