Try reinstalling the 727.

If you still have the problem, then you need to do an uninstall and I would recommend that you remove the entries in the windows registry (KB #685 explains how to do it).

If after that you are still having trouble, try downloading it again (assuming that it is the download version) by Checking-in to your Profile, select the product from the list, select Extended Download Service and click on the Get New Links button. Then reinstalling it.

Mark