Copy and paste the following in a notepad
Then save it as Dell OEM Registry Removal.reg and then double click on it and allow it
Windows Registry Editor Version 5.00
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\OEMInformation]
"Logo"="%SystemRoot%\\system32\\oem\\SystemLogo.bmp"
"Manufacturer"="Dell"
"SupportURL"="http://support.dell.com"
This will remove the Dell Logo in the System Menu