I've noticed the same thing on my PC and it's a quad-core with 8GB RAM so not likely an issue with the machine specs. Never had a issue w/version...
Just confirming that this has been an issue for two of my customers as well. In both cases it was WinXPSP3 and v5 was upgraded over v4. Reverting...
I know I had a customer with an IM-Worm that NOD32 did not detect and still does not over 2 weeks later even after submitting samples. I know...
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