Hi degg03,
Thanks for letting us know about this. Based on the error message you are receiving, it sounds like there is a reference to a file located on your computer within the description HTML of the listing. When such a reference exists, this error will be returned because any files that are hosted on your local machine would not be visible to customers who might view that item.
If you click the HTML tab along the top of the description editor within the saved listing and do a "Find" command for "C:", I suspect that the first part of a reference to a location on your local machine will become highlighted. If you remove any and all instances of references to locations on your local machine, you should be able to post your listing within receiving this error.
If you need further assistance with this issue, I recommend contacting our customer support team using the web form on the following page:
http://www.auctiva.com/help/requesthelp.aspx-Mike