The error "client denied by server configuration" generally means that somewhere in your configuration are Allow from
and Deny from
directives that are preventing access. Read the mod_authz_host documentation for more details.
You should be able to solve this in your VirtualHost by adding something like:
<Location />
Allow from all
Order Deny,Allow
</Location>
Or alternatively with a Directory
directive:
<Directory "D:/Devel/matysart/matysart_dev1">
Allow from all
Order Deny,Allow
</Directory>
Some investigation of your Apache configuration files will probably turn up default restrictions on the default DocumentRoot.