I can project powerpoint but nothing esle from my laptop

what do you mean by other programs? does your desktop get projected fine? if yes, then try running your programs in windowed mode.

you mean something like you cant play movies in full screen over the projector? it's possible your hardware cannot process and output the video for your laptop and external connection at the same time. powerpoint is slow enough + low graphics, while a movie is at least 20 fps graphics, not even taking resolution into account.