mysql fail to start after upgrade

[Xefan]

Good day!
I upgraded xampp for Windows 1.7.3 to 1.7.7
I used exe installer and simply installed xampp in the same directory.
After upgrade apache works well but mysql doesn't start

mysql_error.log:

120325 17:36:08 [Note] Plugin 'FEDERATED' is disabled.
120325 17:36:08 InnoDB: The InnoDB memory heap is disabled
120325 17:36:08 InnoDB: Mutexes and rw_locks use Windows interlocked functions
120325 17:36:08 InnoDB: Compressed tables use zlib 1.2.3
120325 17:36:08 InnoDB: Initializing buffer pool, size = 16.0M
120325 17:36:08 InnoDB: Completed initialization of buffer pool
120325 17:36:08 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
120325 17:36:08 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
120325 17:36:09 InnoDB: Waiting for the background threads to start
120325 17:36:10 InnoDB: 1.1.8 started; log sequence number 23106507
120325 17:36:10 [ERROR] Fatal error: Can't open and lock privilege tables: Incorrect key file for table 'user'; try to repair it



plz help to resolve the problem...