system
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the programs i mentioned SPYWAREBLASTER, and SPYBOY SSD are just to add another layer of defense to your PC . they both have resident sheilds which detect things that AVAST might struggle with and best of all is that there are no conflicts and they use very little resources. No program will do everything but the more you have the better your chances .Just remember about once a week to update them and then run them to see what they find.
keep the programs you have as they are important as well and dont forget to visit windows update regularly and get all those patches . Good Luck 8)