Welcome to ReOS. Before getting started, we need to verify the following :

Xsl Php Extention		This is a php extention needed to run ReOS.
MCRYPT Php Extention		This is a php extention needed to run ReOS.
Config.php		File config.php or folder tpl must be writable.
padmin/galleries		Folder padmin/galleries must be writable.
padmin/tmp		Folder padmin/tmp must be writable.
padmin/imgnews		Folder padmin/imgnews must be writable.

If you're not sure about these, contact your hosting provider.

Check Again !