Remote access from Windoze

[Hilary]

When I try

find-file /me@a.b.c.d:/

from emacs on a WinXP box (with PuTTY properly installed), it prompts

Password for /pscp:me@a.b.c.d:

after entering the password and a long pause, I get

Tramp: Waiting for prompts from remote shell

and nothing more. It's freed by C-g, when it asks for a password again.

When I try the exact same find-file command from emacs on Debian in 
VirtualBox on the same Winny box, it works perfectly. Winny emacs never 
gets to the

Tramp: Found remote shell prompt on `a.b.c.d'

message which Debian emacs has. Have I missed something about emacs 
and/or plink?

--
Hilary