Please visit our website, and create a support ticket. We are not familiar with any issues that may have been caused by a recent Windows Update, so we will need to investigate what is occurring on your computer. It is very important for you to create this support ticket because we need to know if it is something that requires a fix, or if it is a problem that is just occurring on your own computer.
Please follow these instructions for submitting a Support Ticket.
PS: Before you proceed, please restart your computer and try running PokerTracker 4 again. Let us know what error message you see. You only need to double click once because only one instance of PokerTracker 4 can be running at the same time, the second instance will be ignored and will automatically quit. Sometimes you may see it takes a little while for PokerTracker 4 to load up, this may be caused by slow internet connections between our server and your desktop - when PT4 is launched it downloads new configuration files from our server if required.