GHC installation

I might be dead wrong, in that case I apologize... I just took the Windows installer and tried to put GHC etc. on my laptop. I suspect that the installer absolutely wants to put the stuff in Program Files and doesn't give the user the opportunity to install it on another disk. Anyway, I have plenty of space on another partition, but the installer complains that it lacks space. Any suggestions, please? Jerzy Karczmarczuk Caen, France