You've obviously uninstalled the whole shop now, but this is what you need to do:

In the includes folder edit the .htaccess file from:

<Files *.php>
Order Deny,Allow
Deny from all
</Files>

to:

<Files "*.php">
Order Deny,Allow
Deny from all
</Files>

If that doesn't work then delete the .htaccess file in the includes folder.

Vger