After looking at this issue for the hundredth time...I realized that I had completely looked into the error message too much! All I had to do to resolve the issue is copy the Trimble GPS Analyst Toolbox from my install location on the C drive (C:\Program Files\Trimble\GPS Analyst\ArcToolbox\ToolBoxes) to the Toolbox folder of my ArcGIS installation location (C:\Program Files\ArcGIS\Desktop10.0\ArcToolbox\Toolboxes). I was feeling as though there was something more to the issue, when it was very simple to resolve - and we are off GPS'ing!