[betterthanyours]

Go to /includes/ and open config.php you need to uncomment:

// $config['Datastore']['class'] = 'vB_Datastore_Filecache';

and set it to

$config['Datastore']['class'] = 'vB_Datastore_XCache';

Then, you need to go to /includes/datastore/ and open the datastore.php file and set all the vars (between each '') to

vB_Datastore_XCache

e.g.

'vB_Datastore_XCache'

If you need further assistance feel free to contact me.