I am running dual monitors and I downloaded a trial version of Display Fusion to try and have a screen saver on both monitors. The software would not work the way I liked so I uninstalled. Since uninstalling the Screen saver does not work. It will only work in preview mode. I have the mintunes set to 3 and have used one for testing purposed. I am using a wireless mouse and keyboard but the screen saver did work before with the mouse and keyboard by the windows management software.
I have run several Cleaners to get rid of the Display fusion and it seems to have got rid of all of it. However, I still can not get screen saver to work.
You can try perforimg a system restore and check:
I suggest you to put the computer in clean boot state from safe mode and then boot to normal mode and check.
To help troubleshoot error messages and other issues, you can start Windows 7 by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.
Refer the link below for more details:
How to troubleshoot a problem by performing a clean boot in Windows 7:
After you have finished troubleshooting, follow these steps in the above article to reset the computer to start as usual.
Savan – Microsoft Support.