Out of the 500+ installs as of Feb. 13, 2012, we have 3 reports of failed installs, all on LENOVO machines, specifically Z560 laptop, W520, and E420. This means there is something not standard in some Lenovo machines that is stopping full installation. We are investigating the issue to see if anyone with Lenovo has been able to install Chess King and our programmers are preparing troubleshooting tools and a possible fix. We heard that Chess King installed fine on a Lenovo B570 (Intel Pentium CPU B940 2Ghz 4GM ram, 64 bit) Running Windows 7 Home Premium SP1. So Lenovo users please check you have SP1 installed.