A couple of ideas:
1. bglcomp requires that MSXML4 is installed. Check Control Panel>Add and Remove Programs- for 'MSXML 4.0 SP2 Parser and SDK'.
If its not there download the installer here:
MSXML 4.0. Download and run the 'msxml.msi' file-5.0MB.
2. recheck your edits in the .xml file. Any missing spaces or quotes, or data in the wrong format can cause bglcomp to fail.
Dave
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.