I'm sorry to hear about the difficulties you are experiencing.
Since the Auctiva Uploader has not loaded for you since you changed to a new Windows 8 computer, there are a couple specific things to consider.
First of all, the Auctiva Uploader is not compatible with the Metro (or touchscreen mode) so you will need to make sure you are working with Auctiva from desktop mode. If you are currently in Metro mode, you should be able to switch to desktop mode by clicking the “Desktop” tile on your Start screen.
If you are encountering this issue while in desktop mode, then I suspect the uploader is not loading because you do not have Java (which powers the uploader) installed or that there is an issue of some sort with your copy of Java.
In that case, I recommend going to http://www.java.com/verify/ and using the provided button to confirm that you have the latest version of Java installed. If you are informed that you do not have Java, or that your version is out of date, you will likely just need to download the latest version when prompted to get the Auctiva Uploader working.
The old version of the Auctiva Uploader which member_8880 mentioned does not work any longer, but we should definitely be able to help you get the version of the uploader that is currently available on our site working for you.
If you need any further assistance with this, please contact our Customer Support team directly from under the “Help” tab on our site and we will be happy to continue working with you on this.