Unable to uninstall an incompatible module I have 6.22 core and by mistake added the folder for quicktags 7.x-3.0 to the modules folder.

I deleted the folder, replaced it with 6.x but nothing seems to allow me to enable the quicktabs module under "Home » Administer » Site building » Modules."

All I get against the quicktab folder is:


  This version is incompatible with the 6.22 version of Drupal core.


How can I install the correct version of the module?
Install drush, and type 

drush cc all


to clear the cache, then

drush en quicktags


to enable the module; sometimes drush saves my day, when the admin>>modules throws errors.