>When I using CONVERT function to convert nvarchar to numeric, I getting error message "Error converting data type nvarchar to numeric".
>I read help, and figured out that it is because there is charachters inside nvarchar variable.
>But is it possible to convert the same variables without errors, but zeros instead? :)

I am not to good with regular expression, but you could probably use them to change all non-numeric charaters to a 0.

Something like...

SET @myvar = REPLACE(@myvar,'[A-Za-z]','0')

BOb