PingPlotter Pro Trial Update + DEP Update
In addition, we're having some reports of people having problems when running a CPU with DEP built in *and* with it enabled in their operating system (Windows XP or Windows 2003 server only). If you're getting access violations when starting PingPlotter Pro, and there's no way to trace to a target, then try adding an exclusion for PingPlotter Pro in your DEP protection settings.
The Microsoft site has more information on DEP here: http://support.microsoft.com/kb/875352
As soon as we determine what's happening here, we'll work on getting a fix out that doesn't require this workaround.