PPM isn't CPAN, try the following from the command prompt:

cpan Lab::VISA

I suspect that Lab::VISA isn't in any of the repositories you have set up for PPM.

See Installing Modules from the tutorials section of this site. For example A guide to installing modules for Win32 explains the difference between PPM and CPAN, how to instal from both and how to configure more repositories.

In reply to Re: Install Module from CPAN by marto
in thread Install Module from CPAN by Bintuch

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