If you're one of my customers, I urge you to register as a user of my web site. This will help me to provide you with better support, and will also add you to my monthly newsletter. After you've registered, you can use the Login Form on the home page to log in.
If you're still running Windows XP, you may no longer receive security updates, so your two choices are to either stick with XP or to upgrade to Windows 7...
