Several things you could try. First off is to go back to a restore point before this problem started. Normally you would do this through 'Control panel - Restore' but that is not an option in your case !
Immediately you boot your computer, while the BIOS screen is showing, press the 'F8' key - this will bring up the boot options screen. Down towards the bottom is an option 'Repair computer'. Use the up and down arrows to select this and the 'Enter' key to choose it and 'Repair' will start to run. It may fix the problem without any further input from you. If it does, great. If it doesn't, it will come up with a screen asking if you want to choose 'Advanced repair options'. Select this, and the next screen will ask if you want to restore from an earlier restore point. Again, select this.
Here, a screen will open up listing the available restore points with the dates they were created. Choose the latest one from before this problem started happening and let it run, and your problem should be fixed. If it isn't, you can repeat the process choosing an earlier restore point.
Alternatively, you can run a repair install from a Windows installation disc. Start your computer, put the disc in a drive and re-boot. You will get a message 'Press any key to boot from CD'. Do so - I usually hit the space bar, it's the biggest ! Once it has gone past the starting Windows screen you will be given a choice screen - 'Install Windows' or 'Repair Windows'. Choose 'Repair', and again, let it do what it does. Again, this should sort your problem.
One other point, it is possible you have picked up some infection that is causing your problem, although I haven't heard of one that knocks out 'Control panel'. I suggest that, if you haven't already got it, you download Malwarebytes from here :-
install it and follow the instructions.