The clip probably failed since it would use the entire extent of the clipping dataset. As to why Hawth's tools failed I can't say but if you go to the help you will see some of the limits on naming. If you can't get that to work you could try one of the ArcGIS analysis overlay tools, the availability of which hinge on your license level but the Intersect tool should be in all of them. Be sure to recalculate lengths afterwards if you are using shapefiles. You may need to export the results to an pivot table, use ArcGIS's summarize, or use other means as part of your analysis but the splitting and attributing will be done in the overlay.
