aptitude error-lenny confused

[Paul Cartwright <debian@pcartwright.com>]

ok, so I screwed up & reinstalled a package from the lenny CD.
# aptitude upgrade
The following packages have unmet dependencies:
  libkrb5-3: Depends: libc6 (>= 2.9) but 2.7-18lenny7 is installed.
  libc-bin: Breaks: libc6 (< 2.10) but 2.7-18lenny7 is installed.
  libgfortran3: Depends: gcc-4.4-base (= 4.4.2-9) but 4.4.5-12 is 
installed.
  nscd: Depends: libc6 (> 2.11) but 2.7-18lenny7 is installed.
  libc-dev-bin: Depends: libc6 (> 2.11) but 2.7-18lenny7 is installed.
  util-linux-locales: Depends: util-linux (< 2.13.1.1.0-0) but 2.16.2-0 
is installed.
  openssh-client: Depends: libc6 (>= 2.8) but 2.7-18lenny7 is installed.
  libc6-i686: PreDepends: libc6 (= 2.11.2-6+squeeze1) but 2.7-18lenny7 
is installed.
  libqtcore4: Depends: libc6 (>= 2.9) but 2.7-18lenny7 is installed.
  rxvt-unicode: Depends: libc6 (>= 2.9) but 2.7-18lenny7 is installed.
  libqt4-network: Depends: libc6 (>= 2.10) but 2.7-18lenny7 is installed.
  libc6-dev: Depends: libc6 (= 2.7-18) but 2.7-18lenny7 is installed.
  libqtgui4: Depends: libc6 (>= 2.9) but 2.7-18lenny7 is installed.
  openssh-server: Depends: libc6 (>= 2.8) but 2.7-18lenny7 is installed.

so how do I fix it?
now I can't install anything else until this is resolved..

--
Paul Cartwright