Question: how to install xcrysden in windows?
Answer: Unpack the *. tar. ... 
Define the XCRYSDEN_TOPDIR and XCRYSDEN_SCRATCH environmental variables (XCRYSDEN_TOPDIR should point to XCrySDen root directory).
Create the XCRYSDEN_SCRATCH directory.
Launch the program as xcrysden.
From time to time clean the $XCRYSDEN_SCRATCH directory.