Norton Security Slows Computer to almost a total stop

I have noticed a trend that started a few months ago that I am hoping someone can fix.  Once every month or so, my computer with Window's 7 goes from lightning fast to almost a complete stop. Literally every click takes seconds to initiate. The general solution is to restart the computer, then everything is fine again.  A few days will go by, then, the same problem again.  If I uninstall, then reinstall Norton, the probably then goes away for several weeks again, but eventually the cycle repeats itself.  I am at that juncture where it is time to reinstall Norton again. 

Any ideas?