uploading media error

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Im getting an error when I try to upload any media(pictures or files etc.). Its saying missing temporary folder.

I’ve tried
1)changing file permissions,
2)editing wp-config with this code and adding temp folder define(‘WP_TEMP_DIR’, dirname(__FILE__) . ‘/wp-content/temp/’);
3)upping wp php mem to 128M
4. disabling all plugins

Any help would be appreciated.