My OS is Windows 7 and I run AVAST 5 free (all shields on) and Windows Defender in real time (all options on).Everything looks terrific and secure,but should I keep going so?
Yes.
Keep Windows Defender updated through its portal:
Latest definition version: 1.91.362.0
http://www.microsoft.com/security/portal/Definitions/ADL.aspx
Download then instal updates per instructions:
Install the latest Windows Defender definition updates
http://www.microsoft.com/security/portal/Definitions/HowToWD.aspx
Maybe you need a firewall, a secure(d) browser and a second-opinion with MBAM scanning