Increasing the WordPress Memory Limit

1. Edit your wp-config.php file and enter something like:

define('WP_MEMORY_LIMIT', '256M');

WordPress memory can be different to the server – you need to set this regardless of server memory settings
http://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP

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2. If you have access to your PHP.ini file, change the line in PHP.ini 

If your line shows 32M try 256M:

memory_limit = 256M ; Maximum amount of memory a script may consume (256MB)

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3. If you don’t have access to PHP.ini try adding this to the .htaccess file:

php_value memory_limit 256M

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4. If none of the above works then talk to your host.