To disable the module it is enough to edit app/etc/modules/Unirgy_StoreLocator.xml and make sure

<activ>true</active>

is changed to

<activ>false</active>

Disabling from Admin System>Configuration>Advanced is not going to work.

If full removal is needed, then all extension's files should be removed. These are:

• app/etc/modules/Unirgy_StoreLocator.xml
• app/code/community/Unirgy/StoreLocator/
• app/design/frontend/base/default/layout/ustorelocator.xml
• app/design/frontend/base/default/template/unirgy/storelocator/
• js/storelocator/
• app/locale/en_US/Unirgy_StoreLocator.csv
• skin/frontend/base/default/css/storelocator.css

If you want to remove all database traces of the module you should:

DROP TABLE `ustorelocator_location`;

and

DELETE FROM `core_resource` WHERE `code` LIKE 'ustorelocator_setup' LIMIT 1;

You may need to adjust above lines to account for table prefix.

Any traces of the module should be now removed, remember to flush cache and re run compilation if you use it.