This forum has many great guys and gals, just ready to offer assistance. Since no one has come to your aid, I would have to assume that your problem is not very common and probably not related to Win 7. May I suggest, try another key board. You could go out get a real cheapie or borrow one. Sorry, but that is truly the best advice that I have.
Edit Just know about Excel, you can set how thousands sep is shown, as well as dollar and Euro. Check those setting in Excel.