
To remove the key from the registry type the following command: slmgr.vbs -cpky

To remove the license and the key all together type: slmgr.vbs -upk

You can also delete/backup the license at: C:\Windows\System32\OEM

For removal of the logos delete the logos located at: C:\Windows\System32\oobe

You can also delete the registry entries:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\OEMInformation]
"Logo"="C:\\Windows\\System32\\oobe\\ABIT_badge.bm p"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Media Center\Start Menu]
"OEMLogoUri"="C:\windows\system32\oobe\ABI_MCE_log o.png"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winsat\WindowsExperienceIndexOem Info]
"Logo"="c:\\windows\\system32\\oobe\\ABIT_badge.bm p"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\OEMInformation]
"HelpCustomized"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\OEMInformation]
"Manufacturer"="ABIT"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\OEMInformation]
"SupportURL"="http://www.abit.com"

Note: This reg is for ABIT, on your machine they will corespond to the logos you have installed. 