Good to hear, although I am not aware of any inherent conflicts between Internet Explorer and the Auctiva Uploader which should make it so you are unable to use the uploader successfully through that browser.
It is difficult to determine what may be preventing you from using the Auctiva Uploader without knowing more about the exact behavior you are experiencing, such as any errors messages that are being generated.
However, I have worked with a couple users recently who were receiving Active X related errors while trying to use the uploader who reported that uninstalling and re-installing Java was necessary to get the uploader working again, so you may want to give that a try and see if it does the trick.
You should be able to uninstall any instances of Java that are currently loaded on your computer from the “Add/Remove Programs” or “Uninstall a Program” area within your Windows Control Panel. Once complete, you should then be able to re-install the latest version of Java anew from: http://java.com/en/