Help-me !!! MD5 PASSWORDS! GRRR :@

[TibiaGameHost]

Hello, I have a server tibia 1 year and a half without resetting, and I can not reset it, and I put another executable to see what it was like, etc ... are caught less And this new executable, formed all passwords in MD5, not now or log in to the game or the site, account or password.
I turn on the server, because nimguem enters the password invalid,
I was wondering, how do I fix this, to enter or not the site or in the game, and I can not reset my accounts.

 

[Cronox]

MD5? why not use sha1?

for change passwords to sha1 need exacute this query..

UPDATE accounts SET password=SHA1(password);