If you run into memory errors after installing the plugin try running through these steps.

1 Try adding this line to your wp-config.php file:
define('WP_MEMORY_LIMIT', '64M');

2 If you don’t have access to PHP.ini try adding this to an .htaccess file:
php_value memory_limit 64M

3 If you have access to your PHP.ini file, change the line in PHP.ini file to use a higher value:
memory_limit = 64M ; Maximum amount of memory a script may consume (64MB)

4 Talk to your host.