As per the docs:

Sys::Syslog is an interface to the UNIX syslog(3) program.

so it is not likely to run under Windows.

There is no PPM for Sys::Syslog as it is a pure Perl module and does not require any compilation. Perl, nor PPM will however provide you with the syslog(3) program for Windows.

It is quite strange that ActiveState does provide in its PPM-repository Logger::Syslog which depends on Sys::Syslog. PPM installs Logger::Syslog, but it will of course crash since it cannot find a working Sys::Syslog.