Please try entering it again. If you continue to have difficulty, please send e-mail to yuv422@aol.com. Sorry, the VideoScope serial number you entered was not valid. Please keep your serial number for future reference. You may need to enter it again if you reinstall or upgrade your system software. Thank you for registering your copy of VideoScope! http://order.kagi.com/?S75 This is an unregistered copy of VideoScope. Please register your copy if you decide to use it after 15 days. To register via the Internet, click “Register Online” below or visit the YUV422 Software website at http://users.aol.com/yuv422. VideoScope is Shareware!