Categories dabatase error

I was having problems deleting comments (sending referrers) so i looked on the forum and found a code that could help. I copied and pasted the code but it didnt work. I then wanted to removed the new code and past the old one but had no back up. I downloaded the latest version of wordpress (1.5, im using 1.2) and i lost my categories. How can i get them back? By the way, i changed the code in the admin_functions.php file (wp-admin folder). This is what it says:

Database error: [Erreur de syntaxe pr�s de ‘WHERE category_parent = 0 ORDER BY cat_name’ � la ligne 1]
SELECT cat_ID FROM WHERE category_parent = 0 ORDER BY cat_name

Do you think that if i got the 1.2 version back and paste it in my server it would work? If so, where can i find the old version?

Thanks a lot! 🙂