This is probably an error in one of the startup files. (txt files in Xolox folder) Try moving them somewhere else temporaraly, and try to restart Xolox. (Note: you may want to leave the GWebCache file so Xolox can find new hosts, that one is probably not the problem bu can be) If Xolox starts, it was most likely due to data that was sent to Xolox incorrectly, which Xolox then saved.