What AV program are you guys using with Windows 7 Ultimate? I had been using Kaspersky's beta for 64-bit OS and I believe it was giving me all kinds of problems. I uninstalled it and things seem more stable. I'm now trying Panda AV Pro beta for Win 7 Ultimate. So far so good.

Apparently there are others who have had issues with the Kaspersky beta. Kaspersky Antivirus technical preview for Win 7 problems

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