What exactly are you meaning? If you are wanting nothing at all to appear as you boot then not sure if it can be done, you can however change the boot screen, easiest way is to use some of the programmes available on the net. I have used StyleXP in the past to do that and have had this as my bootscreen
Also used it on a few of my friends computers when I have been repairing them and they get a fright when it boots up for the first time thinking they have a pirated edition of windows.
Hood