Trouble shooting with Endnote 5 on Windows Vista

I have downloaded version 5 onto word 2007 (Vista) as per the instructions on FAQ page on the endnote website. However, when i open a word document & click on add-ins, i am able to see the Endnote tool bar but unable to use the keys and a message ‘Invalid Class String’ appears. Could someone help please in rectifying this problem. Many thanks. Appu

How can you possibly expect such an old version as EN 5 to be compatible with current software? Anyway, check out this thread, I think it’s about the same problem.