user warning messages keep popping up even after uninstall
Most probably the disabling and uninstalling process of the modules didn't went smoothly. According to this help page on Drupal.org:


  Restore the module and actually disable and uninstall it (recommended if possible): First, restore the module to its original location in the file system. Then either go to the Modules page and disable/uninstall it from there, or use Drush (drush dis module_name &amp;&amp; drush pm-uninstall module_name, where module_name should be replaced with the name of the module).


Don't forget to also clear the caches, that "magic" feature also resolves a lot of problems ;)

You could also disable the specific message by using the Disable Messages module. However, I would recommend to try cleaning up your Drupal configuration that are causing the messages.