Problems using .htaccess

I am trying to access the following page:
http://www.webfinds.co.uk/wp/category/laptop/?tag=tag1
using the url:
http://www.webfinds.co.uk/wp/laptop-tag1/
But I get a 404 page, what am I doing wrong?

Here are the details of .htaccess

Code:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wp/

RewriteRule ^laptop-tag1/$ category/laptop/?tag=tag1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wp/index.php [L]
</IfModule>