system
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I have the lovely privilege of maintaining our computers at the office, 4 Win towers in house, 4 Win laptops and 1 Linux server. We were using AVG free, then I got my U3 drive that ran Avast and upon insertion, Avast found infections. After many months of chasing the infections I have found that no one program does it all or platform (anti-virus vs anti-spyware, etc). One computer was running Norton IS along with WebRoot and still had an infection. So, I have an arsenal of removal tools now and I try to check all once a month, very hard with the laptop people. Things are better now but I will still find an infection every now and then. So I have three rules, 1. check with multiple platforms, 2. check regularly, 3. don’t trust anyone or anything fully because nothing is perfect and people lie or just don’t know.
A wish of healthy computers to you all! And good luck to all that maintain them. 