PDITool is written in Visual Basic 6.0 and may require VB6-runtimes to run.

They can be downloaded from this page:
http://www.karenware.com/powertools/runtimes.asp

To contact me with questions or bugreports please visit forum.doom9.org and 
contact me (WPELLE) via Private Message or you could post in our "official" thread:
http://forum.doom9.org/showthread.php?s=&threadid=47259&perpage=20&pagenumber=1