IMHO DonnaB is giving you great advise. No matter what decision you make about Anti-Virus and which one you decide to
keep, you should read this topic here in the forum about Norton!
Norton is a resource hog and badly bloated. Norton is not the software it once was.
After you finish the chkdsk and it checks out; should say if it checks out, we might try a clean boot and see if we can find a app.causing your problem. (I personally suspect the App causing the problem is Norton)
PS Very nice reply DonnaB!!
This is quite a long process. I would remove Norton first and then listen to DonnaB for further suggestions.
Edited by donetao, 21 July 2014 - 08:12 PM.