This might explain the issue you are having:

Bug #89837 for Win32-SerialPort: Install fails when Com1 is not present

Regards,
Kristian Kallenberg

In reply to Re^2: Using Win32::SerialPort on Win7-64bit under 64-bit Strawberry Perl by Anonymous Monk
in thread Using Win32::SerialPort on Win7-64bit under 64-bit Strawberry Perl by gri6507

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