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Since when this happening?
Click on start(left bottom of the screen) >
Type System Restore in search >
In system restore choose a date when everything was running fine >
Continue with the restore process >
Computer will restart after a restore.
Note: You will not loose any data or information during a restoration process.
See if that helps, else let me know for further help.
Ok try performing it another way:
Restart the computer >Press and tap F8 while restarting >Advanced Options Menu will appear >
Select Repair Your Computer >
Press Enter >
Click Next >
Click System Restore >
Computer will restart after the restore process.
Let me know, if that helps.