110904 10:45:35 [Note] Plugin 'FEDERATED' is disabled.
110904 10:45:35 InnoDB: The InnoDB memory heap is disabled
110904 10:45:35 InnoDB: Mutexes and rw_locks use Windows interlocked functions
110904 10:45:35 InnoDB: Compressed tables use zlib 1.2.3
110904 10:45:35 InnoDB: Initializing buffer pool, size = 325.0M
110904 10:45:35 InnoDB: Completed initialization of buffer pool
InnoDB: Error: log file .\ib_logfile0 is of different size 0 36700160 bytes
InnoDB: than specified in the .cnf file 0 68157440 bytes!
110904 10:45:35 [ERROR] Plugin 'InnoDB' init function returned error.
110904 10:45:35 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
110904 10:45:35 [ERROR] Unknown/unsupported storage engine: INNODB
110904 10:45:36 [ERROR] Aborting
110904 10:45:36 [Note] D:\MySQL\bin\mysqld: Shutdown complete
解决办法：
1、在MY.INI文件中的 [mysqld] 中
增加一行 tmpdir="D:/MySQL/data/" 修改后，
还是启动不了或者能启动但关机后又出现同样问题，
接着我做了第二步，重启正常。
2、删除DATA目录下除数据库文件夹外的其他文件，重启mysql，问题解决。
或者也可以： 先卸载，然后将原来存储数据的目录删除，再重装ok。
