Please follow @Sourav's advice.
If after restarting the server you get errors, you may need to set your directory options as well. This is done in the <Directory>
tag in httpd.conf. Make sure the final config looks like this:
DocumentRoot "C:\alan"
<Directory "C:\alan">
Options Indexes FollowSymLinks
AllowOverride All
Order allow,deny
Allow from all
</Directory>