Error using conversion from raster to polygon

Discussion created by akuder201 on Sep 26, 2011
Latest reply on Sep 27, 2011 by spk578
Just getting back into GIS after being out of the game for a few years and I was wondering if anyone has any suggestions on why I am having trouble converting a raster image to a polygon in ArcGIS 10?  I downloaded the data from PASDA, a Pennsylvania clearinghouse run through Penn State, and it displays fine however I keep getting an unknown error message (ERROR 999999) when I try to run the geoprocessing tool to convert it from a raster image to a polygon.  Do I have to change the type of raster extension to get a better result, such as changing from .img to .tiff?  Also does cell size affect the outcome of the conversion?  Any help would be appreciated.