The canonical demo script to run to test is widget. It should have been put into C:\perl\bin (or equivilent) when the Tk ppm was installed. If that doesn't run, then you've got problems.

perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'