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Hello everybody. I need help with VirtualBox on Windows 8.1/10
I've got a problem with NAT at version VB 4 and windows 8.1 and upgrade to VB 5 and windows 10 did not solve it.
I don't know what has happend but ethernet adapter named "Bridged network" has disappeared from host system and since that moment guest doesn't have access to internet via NAT.
I tried to reinstall VB many times but it doesn't help.
Can someone give any advice for this case?

There have been a few problems with this in 5.0.x . One thing you could try is go to the settings of the vm and clear the checkbox from the Enable Network Adapter box of the NIC you have selected and use a different NIC in the vm. This solved a similar problem for me.