if anyone has this problem as well, i'm going to be helpful for those unlikely other ppl on this forum...
just go to C:\WINDOWS and there you'll find "boot.bmp" this is the file that makes your bootscreen, if you got the same problem like I had then delete this one, afterwards you'll need to put the original back in that place cause otherwhise you don't have a bootscreen :p
or you can make one of your own ^^
Cheers