I had to do a system restore on my PC and now my NIS 2013 won't open and I can't turn it on

I had to do a system restore on my PC and now I am not able to turn it on or open it.  The same was true with Windows Defender, but it finally turned on and I am covered.  Obviously, I prefer to use the NIS 2013 which I have purchased.  Should I uninstall the program and reinstall?  Your help and solution to this issue is greatly appreciated.