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How to map a folder to a drive letter in windows
Open a command prompt window.
On windows vista or windows 7, open the command prompt as default user, not as administrator. The reason will be explained later.

Choose from: (i) Go to tools] options] programs and features] tools. Navigate to the programs and features menu.. (ii) Use the subst command to map your folder to a drive letter. For example: subst x: " d: \ documents \ john \ letters ".. (iii) Add the typing library in top left corner. On mac, right-click start (or " utilities "), click file, choose folder, search for the folder you are looking for.. (iv) If doing so, you can press start (ctrl + alt + shift + del). Windows explorer then after your command prompt prompt opens, select " properties..
(ii)