Hi Cherilynn,
We aren't aware of any inherent problems between the Vista OS and Auctiva so, based on the behavior you are describing, I believe you may have an application running on your system that contains a pop-up blocker. The Internet Explorer "Live Toolbar" that works in conjunction with Vista has also been known to cause problem with Auctiva for some users, so that could be the problem as well.
For further assistance with this matter, please file a support request using the approrpiate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike