Here are some good tips to troubleshoot Window freezes. This always requires lots of patience, you need to wait until things free up so that you can save your file and continue.
Then try Cntrl + Alt + Del and wait for the screen to blank before selecting task manager. In task manager click more details, if visible and any non-responsive program should be highlighted and you can attempt to close it or try to recover it. This will take you to a detail tab, where processes are listed with more information on their status.
Right-click the non-responding thread and choose to Analyze the wait chain. This waits to use resources being used elsewhere which can result in the program freezing.
And Sometimes the Task Manager appears to have no effect. In these circumstances, you may be forced to reboot.
