Warning when comment module is disabled

I received the following PHP warning when creating fields for a custom content type.

Notice: Undefined index: comment in entity_get_info() (line 6426 of xxx\sites\d7\includes\common.inc).

Warning: Invalid argument supplied for foreach() in _field_info_prepare_instance() (line 288 of xxx\sites\d7\modules\field\field.info.inc).

Steps to reproduce
1. Disabled the comment module under the "modules" tab
2. Go to Structure -> Content Types and click "manage fields"

Additional info
1. Using XAMPP 1.7.2 on a Windows machine that is running Win XP
2. PHP 5.3.0
3. Apache/2.2.12 (Win32)
4. MySQL 5.1.37