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My machine (XP) seemed to have an adware infection. I think it was "purity scan". Only one user on that machine would see it, and it appeared to be started by a registry entry under HKCU/Software/Microsoft/Windows/CurrentVersion/Run. The command was wuauboot.exe, and if I removed this, the problem went away.
My question is, why did NIS 2008 not find this nor prevent it from running? I did a LiveUpdate and then a full system scan. It was not found. I only have a few days left in my trial of NIS 2008, and if I can't get it to protect this machine, I won't be buying it.
The best thing you can do in such cases is send the file to Symantec.
There is no perfect anti virus. Symantec will catch most of them but not all. That's impossible. There are more than thousand new malware every day. Symantec needsmalware samples to make the right signatures