Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Minimal complaints

After reading the disappointing reviews on MacAffee and Norton, I opted for Zone Alarm. So far, I haven't noticed many problems, though at times I cannot access certain websites, which is frustrating. Works quietly in the background but does slow the system down, mine was by approximately 50%. I bought this in conjunction with Spy Sweeper and they seem to interact seamlessly.