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I was curious and found in my task manager as well, 2 instances each of svchost.exe one for NETWORK SERVICE and the other for SYSTEM, for a total of 4 instances. I downloaded and ran the fix but it did not find the worm on my system. I would have been surprised if it had since I run behind both a norton firewall and an isp one, and also have weekly scans by norton. I would assume therefore, that this is a normal situation when running multiple norton products although it might be useful to ask them why it is so.
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Multiple svchost entries is definitely not abnormal. If you ran that and it says you are clean you probably are. FWIW here are the current svchost entries on my work computer:
