Difficulty disabling magento extension -

Difficulty disabling magento extension -

i trying disable magento cache extension called m-turbo keeps appearing in menu. have gone file artic_mturbo.xml in app/etc/modules , changed <active>true</active> <active>false</active>. there else need to/should/could do. thought "way" disable extension.

magento ver. 1.7.0.0

if edit xml's need clear cache in admin menu, flush cache (button in cache menu right top).

if doesn't work seek renaming app/etc/modules/artic_mturbo.xml artic_mturbo.xml.old or magento doesn't load it, , repeat above, clearing cache.

magento magento-1.7