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Hello i have big problem with virtualbox, i have windows 7 and newest kaspersky dedicated for windows 7(its 6.0 rc version). I installed on virtualbox windows xp, and also kaspersky 8.0 on guest. And when i have 2 kaspersky running: on host and guest, guest system hanging up!!! I'm sure it, i was testing that, don't know why kaspersky on my host system is checking guest system!!

Kaspersky and VB don't play along very well. See the VirtualBox FAQ, it's internet security blocks the NAT mode so the Guest can access the internet. I'm sure there are other things that aren't working all that well. I recall a user who couldn't boot the VM because he had Kaspersky on the Host, or lost internet on the Host because he had it running on the Guest (one of the two). If you search the forums using Google (add the site filter with site:forums.virtualbox.org) to find more information about Kaspersky and VB. The main thing is that it's a piece of junk when you want to use VB. There are other, better security software that are even free.