Problem with .htaccess MU Engine Web

Hello, I am using a web, it uses a .htaccess that is giving me some problems ... The problem is that I can not use subfolders, ie mydomain.com works but I can not login to mydomain.com/forum ... I have to do it if or if through a subdomain, I would like to know how to avoid this. I leave the .htaccess below:

Code:

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RewriteEngine on
RewriteCond %{REQUEST_URI} !^/admincp/$ [NC]
RewriteRule ^([a-zA-Z0-9]+)/([a-zA-Z0-9]+)/([a-zA-Z0-9\/]+)/?$ index.php?page=$1&subpage=$2&request=$3 [QSA]
RewriteRule ^([a-zA-Z0-9]+)/([a-zA-Z0-9]+)/?$ index.php?page=$1&subpage=$2 [QSA]
RewriteRule ^([a-zA-Z0-9]+)/?$ index.php?page=$1 [QSA]

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thnks!

Try this:
.htaccess mod_rewrite - how to exclude directory from rewrite rule - Stack Overflow

PHP Code:

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RewriteRule ^(folder|folder|folder)($|/) - [L] 


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Thanks! Closed please.