I must be honest, I really wanted to make that a happy face for Christmas, but I do not have the expertise to make WM work with 7. I would be able to help with WLM, though.
I can help you in one way. If you are going to change the registry and make other tweeks. Make a system Image of your hard drive and store it in a safe place. At least 10% of the questions that I get, are problems caused by tweeks.
In any event, sorry I could not be more help, but I truly wish that you and your loved ones have a wonderful holiday and a safe and Happy New Year.