Error messages?

So I had an issue with my forum and I had to move servers so the arcade main page is there but if I click on any of the categories I get an error saying the page isn't there..... I have tried re installing... is there something I am missing?

Thanks for your help, even though I know it's not your fault and it's operator error!

this works fine http://www.mysite.com/forum/arcade.php?

this does not work http://www.mysite.com/arcade.php?&ac...lay&gameid=165

this does not work http://www.mysite.com/forum/arcade.p...t=Arcade&cat=1

Okay so I see what is wrong but how do I fix it???????

Thanks for helping a dummie like me!