For both of the posters asking about this, I'm going to second Phil's earlier comment. If you're using SSIS for ETL, don't use xp_cmdshell to fire executables against the operating system. The Execute Process Task is a much better tool for this.
Tim Mitchell, Microsoft Data Platform MVP
Data Warehouse and ETL Consultant
TimMitchell.net | @Tim_Mitchell | Tyleris.com
ETL Best Practices