Unknown device ACPI\AWY0001 *AWY0001 / Dispositivo desconocido AWY0001 / Périphérique inconnu AWY0001

FIX :
This unknown device is related to the AMD Away technology. This is basically a souped up sleep mode that is not needed in Windows 7, hence the absence of driver. Below you can download a null driver that will remove the unresolved hardware detection exclamation mark.  This driver should also works if you are using an Intel processor.

http://eu.msi.com/service/download/driver-2670.html

If the link is dead you can also copy the following text to a text document, save it as “AmdAway.inf”, and then follow the installation instructions below:

;*******************************************
; AmdAway.inf
; Null INF for "AwayMode" ACPI device
; Version 1.0.1.0
; (C) Copyright 2006 AMD, Inc.
;*******************************************
[Version]
Signature="$WINDOWS NT$"
Class=System
ClassGuid={4D36E97D-E325-11CE-BFC1-08002BE10318}
Provider=%AMD%
DriverVer=04/06/2006, 1.0.1.0
CatalogFile=AmdAway.cat
[ControlFlags]
ExcludeFromSelect=*
[Manufacturer]
%AMD_MFG% = AWAY_MODE,NTamd64
[SourceDisksNames]
[SourceDisksFiles]
[AWAY_MODE]
%*pnpffff.DeviceDesc% = NULL_DRIVER, *pnpffff
%*pnpffff.DeviceDesc% = NULL_DRIVER, ACPI\AWY0001
[AWAY_MODE.NTamd64]
%*pnpffff.DeviceDesc% = NULL_DRIVER, *pnpffff
%*pnpffff.DeviceDesc% = NULL_DRIVER, ACPI\AWY0001
[NULL_DRIVER]
[NULL_DRIVER.Services]
AddService = , %SPSVCINST_ASSOCSERVICE% ; null service install
[Strings]
AMD = "AMD"
AMD_MFG = "AMD"
*pnpffff.DeviceDesc = "AMD AwayMode"
;*******************************************
;Handy macro substitutions (non-localizable)
;*******************************************
SPSVCINST_ASSOCSERVICE = 0x00000002

INSTALLATION INSTRUCTIONS:

To install the Null INF, copy the installation files to a temporary directory, then use the “Device Manager” to perform an "Update Driver" operation as follows. 

1) Right Click on "My Computer" and select "Properties".

2) Select the "Hardware Tab" and hit the "Device Manager" button.

Note: There should be a device section named "Other devices" (big yellow question mark) with a device named “Unknown device".

3) Right-click on "Unknown device" and select "Properties". Click on the “Details” tab

    to be sure the “Device Instance Id” starts with “ACPI\AWY0001”.

4) Select "Install from a list or specific location (Advanced)".

5) Click "Next" to continue.

6) Select "Don't search. I will choose the driver to install."

7) Click "Next" to continue.

8) Click on "Have Disk".

9) Specify the temporary directory location of inf file (AmdAway.inf).

10) An entry "AMD AwayMode" should appear under the "Model" Section.

11) Select that entry and click "Next" to continue.

12) A box will appear "The wizard has finished installing the software for

      "AMD AwayMode" and click "Finish".