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You didn't say which version of perl you're using, so I can't say for sure which repositories you should be using, but here's the official list.<br />
<br />
<a href="http://win32.perl.org/wiki/index.php?title=PPM_Repositories" rel="ugc">http://win32.perl.org/wiki<wbr />/index.php<wbr />?title=PPM<wbr />_Repositor<wbr />ies</a>
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You didn't say which version of perl you're using, so I can't say for sure which repositories you should be using, but here's the official list.

http://win32.perl.org/wiki/index.php?title=PPM_Repositories [http://win32.perl.org/wiki/index.php?title=PPM_Repositories]

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My perl version is (v5.12.4), my ppm version is 4.13. &nbsp;I also tried repositories in the link ,still no luck
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My perl version is (v5.12.4), my ppm version is 4.13.  I also tried repositories in the link ,still no luck

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Have you tried my first suggestion, which is the best solution.
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Have you tried my first suggestion, which is the best solution.

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trying the first solution now
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I have a number of perl ppm repository, but i can not find:<br />
<br />
use Net::SFTP;<br />
Math::BigInt::Calc <br />
<br />
or the lastest Math::BigInt::Calc 
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I have a number of perl ppm repository, but i can not find:

use Net::SFTP;
Math::BigInt::Calc 

or the lastest Math::BigInt::Calc 

New repository for Activeperl PPM for Math::BigInt::Calc and lastest use Net::SSH::Perl

Perl is a high-level, general-purpose, interpreted, dynamic programming languages with over 25 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large-scale development projects.  Perl gained widespread popularity as a Common Gateway Interface (CGI) scripting language, in part due to its regular expression and string parsing abilities. In addition to CGI, Perl is used for graphics programming, system administration, network programming, finance, bioinformatics, and other applications.