path to temp directory in cpan
===

I'm trying to install Tk module for perl in windows with cpan.
Problem is:

    Checking if you have Test::More 0 ... Yes (0.98)
    Checking if you have Encode 0 ... Yes (2.44)
    Building Tk-804.03 ... dmake.exe:  Error: -- `C:\Documents' not found, and can't
     be made
    FAIL
    ! Installing Tk failed. See C:\Documents and Settings\Admin\.cpanm\build.log for
     details.

In build.log no additional info. 

How to change path to ".cpanm" directory to any other without spaces? 
Default value is "~/.cpam" and i did not found way to change it.