Do you mean the Dell screen that comes up BEFORE the Windows loading screen? (as in the BIOS splash screen)? - if so, then check in your BIOS, as some bios's (sp?) have an option to turn of the BIOS splash screen (my QDI bios does), but bear in mind that seeing as Dell has hijacked your bios, the chances are they have also removed or disabled the option to remove their lovely logo.
Can see why they do it though really.....advertisting.....errr..wait a minute.....if I can see the screen then I've already bought a Dell....
