Error on open VirtualBox

[manoype]

Hi,

When I try to open VirtualBox, it shows me this error:
Failed to install NtCreateSection monitor: ff 25 e0 e8 12 9 0 0 f 5 c3 f 1f 44 0 0 (rc=-8)

I have searching in this forum and other page but i haven't found this error anywhere.
I have a laptop with Windows 7, but a few days ago i had windows 8 and i got the same error

Could anyone help me?

[Perryg]

https://www.google.com/search?q=Failed+ ... gws_rd=ssl

[manoype]

But I can't open any virtual machine, and i can't open either Windows 7 or Windows 8

[Perryg]

Did you click the link or not? The first topic tells you what you need to know.

[manoype]

Yes, I have seen it, but if I run VB as administrator it shows me the same error

[Perryg]

Hint: continue reading.

[manoype]

Could you tell me what you mean? I have read this post several times and I can't find the solution

[Perryg]

It tells you to click on a topic that discusses what the problem is. Here is the link: viewtopic.php?f=6&t=62615
Read the red text and install the latest test build or revert to 4.3.12

[shvbox]

I have similar Error:
Failed to open a session for the virtual machine bestbox.
Failed to launch Remote Desktop Extension server (Unknown Status -2147467259 (0x80004005)).
Result Code: E_FAIL (0x80004005)
Component: Console
Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

Host: win8.1, guest: Ubuntu 14.0.4, vbox-4.3.15, extension pack 4.3.12, GuestAddition 4.3.14.1RC
I reinstalled several times, tried several versions, always failed. The last time with above version, everything is OK, all LAMP installed smoothly, and I started up several times without any problems. But when finally I started the vbox, it asks to scale mode, I press 'Cancel' button, resulting in this error.
Would somebody help me out? Many, many thanks.

[Perryg]

Extension pack must match the installed version of VirtualBox. In this case 4.3.15 is test build for 4.3.14 so that is the extension pack you need.

[manoype]

Solved, thanks

[Abc123.]

Solved, thanks

I think that my problem is alike. I will install the 4.3.10. It's works well in my computer.