How do you configure windows to store the bitcoin blockchain data into another directory?
Add '-datadir=path-to-directory' to the command used to start the client.  For example,

bitcoin-qt -datadir=D:\Bitcoin


to store the bitcoin files in the D:\Bitcoin directory.  Remember to enclose the directory path in double quotes if it contains spaces.  Also move the subdirectories as well as the main application directory to the new location.