[Onno Kreuzinger]

eh which did you try the full-all-mod installer or the cs_full installer ?
*g* , try the other one :-)

for me reinstalling the cs_full (~380mb) worked when steam gave up.
(4-5 times since november)
usually the cache got inconsistend at update time (wednesday' night of re-installing), sometimes just re-starting steam w/o using it also triggers a "cache ins inconsistend, i will fix it" routine. Or this kicks in after re-install and re-upgrade.

yes i like steam, but only when making tea ....