cmd_prompt> cpan

cpan> install App::cpanminus

[...]
Ok
cpan> q
Lockfile removed.


# now cpanm is installed; see the help..
cmd_prompt> cpanm --help
[..]
-U,--uninstall            Uninstalls the modules (EXPERIMENTAL)
[..]

cmd_prompt> cpanm -U Tk
Tk contains the following files:

[..]

Are you sure you want to uninstall Tk? [y] y

[..]

Successfully uninstalled Tk

cmd_prompt>perl -MTk -e 1
Can't locate Tk.pm in @INC...

# reinstall using cpan client
# UPDATE: or as marto suggest, now you have cpanm use it to reinstall because it is much faster

cmd_prompt> cpan -i Tk

# go take some coffe or tea pot..

[..]
  SREZIC/Tk-804.033.tar.gz
  C:\path\strawberry\c\bin\dmake.exe install UNINST=1 -- OK


cmd_prompt> perl -MTk -c -e 1
-e syntax OK