R help - Nov 2006 - update.packages

Dear All,
from some days when I try to update the installed packages I receive 
this answer:
update.packages(ask='graphics')
--- Please select a CRAN mirror for use in this session ---
Error in as.list(read.dcf(file = file)[1, ]) :
        indice fuori limite # index out of bound
TIA
Giovanni
PS: I have already tried to solve the problem reinstalling R or changing 
the options of update.packages..

-- 
dr. Giovanni Parrinello
Department of Biotecnologies
Medical Statistics Unit
University of Brescia
Viale Europa, 11 25123 Brescia
email: parrinel at med.unibs.it
Phone: +390303717528
Fax: +390303717488

On Thu, 30 Nov 2006, Giovanni Parrinello wrote:
> Dear All,
> from some days when I try to update the installed packages I receive
> this answer:
> update.packages(ask='graphics')
> --- Please select a CRAN mirror for use in this session ---
> Error in as.list(read.dcf(file = file)[1, ]) :
>        indice fuori limite # index out of bound
> TIA
> Giovanni
> PS: I have already tried to solve the problem reinstalling R or changing
> the options of update.packages..
You have a corrupt package installed.  This is an R error just like any 
other, so you should use the debugging tools described in 'Writing R 
Extensions' to find which one, and remove it.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595