[EDIT by Altrea: moved from this post in the german only forum]
I have the same problem. Just installed the latest XAMPP version. from the control panel I can start Apache and Filezilla, but not MySql. I followed your suggestion to start xampp-control-3-beta.exe and to see in the error log what is going wrong. These are the last lines in the error report:
120711 14:17:48 [Note] Plugin 'FEDERATED' is disabled.
120711 14:17:48 InnoDB: The InnoDB memory heap is disabled
120711 14:17:48 InnoDB: Mutexes and rw_locks use Windows interlocked functions
120711 14:17:48 InnoDB: Compressed tables use zlib 1.2.3
120711 14:17:48 InnoDB: Initializing buffer pool, size = 16.0M
120711 14:17:48 InnoDB: Completed initialization of buffer pool
120711 14:17:48 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!
120711 14:17:48 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
120711 14:17:48 InnoDB: Waiting for the background threads to start
120711 14:17:49 InnoDB: 1.1.8 started; log sequence number 1591515
120711 14:17:49 [ERROR] Fatal error: Can't open and lock privilege tables: Incorrect key file for table 'user'; try to repair it
Apparently it has something to do with the privilages. But I have no idea how to repair that. I am the only user on this recently bought laptop which runs under Windows 7 Home
Can you help me?