[MySQL] Seriuos problem please help me.

[Galgula]

Im having a seriuos problem with MySQL.
I opened a server a week ago with PHPMyAdmin 2.11.4 and only yesterday i found it it cause bugs and downloaded the newest version of PMA.

Before i downloaded the newest version, i couldnt turn pages in the table players and everytime i did, it goes back to Structure and i get this msg:

MySQL returned an empty result set (i.e. zero rows). ( Query took 0.0003 sec )
SELECT * 
FROM `players` 
LIMIT 30 , 30

Then i downloaded the newest PMA and kept run my server but then all the players complained that they lose their items so i checked player_items table and got this msg:

Error
SQL query:  

SHOW FULL FIELDS FROM `player_items` ;



MySQL said:  

#145 - Table '.\finlandia\player_items' is marked as crashed and should be repaired

So i made a new table player_items and it fixed the problem and i started to give all my players items then after a hour all my players lost their items in depot! and i got this msg:

Error
SQL query:  

SHOW FULL FIELDS FROM `player_depotitems` ;



MySQL said:  

#145 - Table '.\finlandia\player_depotitems' is marked as crashed and should be repaired

I dont know what is the problem! i downloaded the newest PMA!
Is there any way to fix it? or i have to reset chars...

and if i do, please tell me what i need to do to make sure it wont happen again.

Thanks for helping.