*How long have you had this problem for?
* Please list the ALL the Security software you have on your computer....
Firewall,
Any other AntiVirus program that may have come preinstalled when your computer was purchased,
Spyware,AntiMalware programs.
* Have you checked in Event Viewer?
Type eventvwr in search.
Go to the windows log > application > in the left hand column note anything RED that relates to the problem.
Please note the event ID, and the source codes and tell us what they are.
* Go to Control Panel > All Control Panel Items > Action Centre > Virus Protection etc. > Are they { the relevant ones} all reported as ON?