Problem with clipboard

[neverov_dg]

Hi!

I'm running emacs on WinXP and have problems with inserting text from
clipboard. When I select text in MS Word or Firefox and paste it into
emacs it inserts symbols in latin-1 encoding, but I want him to insert
text in windows-1251-dos encoding.

When I use:

M-x set-next-selection-coding-system RET windows-1251-dos RET

and paste text all work fine, but just one time. I try to use

M-x set-selection-coding-system RET windows-1251-dos RET

but it doesn't help, text is inserted in latin-1 encoding.

Encoding-specific section in my .emacs:

(set-language-environment "Russian")
(define-coding-system-alias 'windows-1251 'cp1251)
(set-buffer-file-coding-system 'cp1251-dos)
(set-default-coding-systems 'cp1251-dos)
(set-terminal-coding-system 'windows-1251-dos)
(set-selection-coding-system 'cp1251-dos)
(prefer-coding-system 'cp1251-dos)

My emacs-version is:
GNU Emacs 22.0.93.1 (i386-mingw-nt5.1.2600) of 2007-02-01 on LENNART-69DE564 
(patched)

How can I fix it?

----
Neverov Dmitry