Error "Some audio devices could't be opened

[tekken]

When I start virtual machine I get an error



Host: Windows 7 x64
Guest: Windows 7/Vista x64

How to fix it?

[Perryg]

tekken,

I believe that this question has been asked about 104 times now.
You need to download and install the drivers from realtek.com and then tell Windows to update.
Also a read of the Forum Posting Guide would help you.
Searching the forum from google.com using sound problems in window 7 site:forums.virtualbox.org will bring up a lot.

[tekken]

Sorry about that
I installed guest additions so I thought I do not need to install another drivers.
My sound device on host is fine on vista guest too but I still get this error at the start of virtual machine.

[Perryg]

No problem just remember this trick. Use your keywords in google followed by site:forums.virtualbox.org.
It will become your best friend!

[tekken]

I reinstalled host, then guest, installed realtek drivers and still the same error. Is it a hardware problem? I have sound on both os, it is strange.

[Perryg]

In the guest settings: Enabled Nested Paging and Enable PAE/NX if they are not already and see if this helps.

[tekken]

It seems work now
But sometimes there is GUI crash during shutting off and wrong cpu speed show in system properties

[Perryg]

This could be caused by the way Windows 7 RC is calling things and also that SMP is so new to VirtualBox.
You may want to wait a little and see what happens once Windows is officially released, but play with it and see if you can pin it down a bit and then get back to us.

[tekken]

OK, I'll wait till Win7 RTM release. I find VirtualBox 3.x very useful.