I would suggest getting rid of it and using Avast as it is a smaller footprint and is less stressful on the resources mentioned above.
It's free and updates twice a day on its own.
Please download Avast from my signature below. Please make sure you do the registration as it is good for a year or more. When it is due simply just reregister it.
Avast in my opinion is better because:
It's FREE to the Home User
It Updates it's Definitions daily
You can scan Individual Files, Folders and Drives
No buying new versions every year