Hello, I am new to Arc Hydro and am trying to generate watersheds. I have read many help documents and lots of StartUp Check List information (such as those by Mark Boucher). My problem is this, I have been able to generate rasters just fine through the following processes: DEM Reconditioning, Fill Sinks, Flow Direction, Flow Accumulation, Stream Definition, Stream Segmentation and Catchment Grid Delineation. The problem occurs when I try to convert rasters to vectors such as in Catchment Polygon Processing and Drainage Line Processing. For each of these steps I receive the ever popular "Error HRESULT E_FAIL has been returned from a call to a COM component". I have tried different machines and also a different data set included with a online tutorial....still same problem at the same place. I feel like I must be missing something obvious.....I'm stuck and would appreciate any help or direction. Sincere thanks.