When you load a bitmap, it becomes the active bitmap. So bitmap 1 is active after loading both of them.
The screen is always bitmap 0, but because you never reset it after loading bitmap 1, it's not getting updated. Your code should look like this:
hide mouse
cls
load bitmap "background.bmp",0
load bitmap "F15.bmp",1
get image 1,0,0,300,300
`*************************
SET CURRENT BITMAP 0
`*************************
sprite 1,170,90,1
wait key
end
Alternatively, once you have created your image, you can delete bitmap 1. The current bitmap will automatically revert back to 0.
BatVink