Why Oxford Advanced Genie does not run under Windows Vista?

Is it compatible with Vista?

Ask the Oxford Advanced Genie creators to check whether it's compatible with Vista, or they might be an additional software to install.

Actually it works under Vista, because I opened a MS Word document and I tried OAG there and the word on which the cursor stayed appeared in the box with its meaning. The problem is not with Vista but with Internet Explorer 7. But I couldn't find a solution yet. Oxford Website is not helpful at all. Any help? Thanks.