hmm i guess you placed the gatherbuddy.exe on your desktop screen then? Look for an badnodes.xml there.
Otherwise i suggest make a file in note pad and paste the following into the file:
<nodesBlacklist>
<bad_location><name>Goldclover</name><waypoint>6064.631 4989.398 -95.52019</waypoint><comment>Automatic blacklist during manouver loop 1/18/2010 8:34:34 PM </comment></bad_location>
</nodesBlacklist>
And press Save as, and save the file as badNodes.xml
insert your own coordinates and name of the node ofc.
Tip: Put gatherbuddy.exe in a folder because if you ever need debug file its easy to find instead of searching all over your desktop.