Loss of cookies...

I am using Norton Security Suite as supplied by Comcast. Recently, after a scan or update, I don't know which, Internet sites I regularly visit, such as newspapers and forums, etc., no longer remember me.  Sometimes I can't see the graphics and I have to re-register. I assume all the cookies for these sites have been removed. If I re-register at each site, than what about the invisible graphics?

 

Need help, please.

 

Thanks.....