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The problem is likely that you have the PERL_TCL_DLL environment variable set. This variable is set when you are using the Tkx GUI toolkit. PPM 4 also uses Tkx, but has its own version of Tkx bundled; hence, the environment variable points PPM 4 away from its version and to your ActiveTcl installation, which doesn't have all of the files necessary to run PPM 4.

The solution is to unset that environment variable before running PPM 4.

Here is a batch file for manipulating the relevant environment variables:

@ECHO OFF
SET MODE=%1

IF "%MODE%" == "PDK" GOTO PDK
IF "%MODE%" == "CLI" GOTO CLI
ECHO "no valid input? usage: DBSET "
ECHO "possible modes PDK or CLI"
GOTO END

:PDK
SET PERL5LIB=C:\Program Files\ActiveState Perl Dev Kit 6.0\lib\
SET PERL5DB=
GOTO REPORT

:CLI
SET PERL5LIB=""
SET PERL5DB=BEGIN { require 'perl5db.pl'; }
GOTO REPORT

:REPORT
ECHO Debugger mode set to %MODE%

:END

Copy the code into a file called DBSET.BAT, and move it into a directory in your PATH (e.g. C:\Perl\bin).

To use perl's regular command line debugger:

C:\> DBSET CLI

To use the PDK Debugger:

C:\> DBSET PDK