use strict and warnings

***** Software Inventory Report *****
-------------------------------------

Use of uninitialized value $total_count in concatenation (.) or string
+ at 
Total software packages:
Use of uninitialized value $total_out in subtraction (-)  
Use of uninitialized value $total_count in subtraction (-)
Total software packages available: 0
Use of uninitialized value $total_count in concatenation (.) or string
+ at 
Total cost for  pieces of software: 4996.99
[download]

Start your debugging by eliminating those warning messages.

Better yet... promote your warnings to errors:

use warnings FATAL => 'all';
[download]

Update: those warnings occur because you did not initialize those variables before you parse your XML file. Move the parsefile line after the variable declarations/initializations.