I should have added that all comments about installation failure should be addressed to Shareware Onsale. The version downloaded from the Tweakmaster website should install on most PC’s without issue. (not XP) Over the years when customers have had trouble with the installation process, it is usually because some background software they are running is interfering with the process. The only way around that is to shut any antivirus or anti adware software down which may be blocking the install and install it again. You can also boot into safe mode and run the install. IF it still won’t install, then the software is just not for you.