Hi Antonio
I will suggest that you try to repair the tables first
Use instruction from ASGER here:
http://www.dmm-support.dk/smf/index.php?topic=15.0(see attached file about how to repair mysql tables)
Instead of repairing SDBDATA1 as pr picture, try to repair SDBREG
If you find no fault, try to repair all the other files.
On picture 2 in the instruction, You can mark several files at the same time by holding shift in, then repair
If its still not working, please send me the 3 files called sdbreg
You find them in C:\mysql\data\SDBDATA
I will then test the files on our test server
Kind Regards
Morten