Perhaps you're behind a proxy and need to provide your credentials. Without knowing exactly what's going on people can only make suggestions which may or may not work. How do I post a question effectively? has a lot to say on this topic. I suggest you post the output of this command, using the formatting described in the previous link.

the exact message is

Warning : no success downloading 'C:\Perl\cpan\sources\authors\01mailrc.txt.gz.tmp3332'.Giving up on it

I doubt that this is the entire output of the command. In your previous post people had to draw information from you piece meal, this gets boring quite quickly. Please read my previous comment again.