Hi jkmanta -
To remove the store window from your active listings you must delete the store window html from the html description using eBay's "Revise Item" form.
Go to your listing in eBay - click to "Revise Your Item" - find the description section and make sure it is showing HTML - Then find and remove everything from the opening <ASW> tag to the ending <ASW> tag taking care not to remove anything else. Make sure to preview your listing and then save the changes.
Hope this helps!
Cara