Best to state at outset, it will not cause a problem - someone changed the file.
You need to look in c:\windows\system32 for
OEMINFO.INI. If you rename this file to .old, the
logo will go away. You can also edit the file; The format of the file is as follows:
Manufacturer=Some Manufacturer Name
Line1=For Technical Support contact:
Line3=Manufacturer service dept