Win 2003 blocks the exec of jobs of SQL

recently we migrated of windowos 2000 to Windows 2003, but we have had problems with the jobs of SQL that worked correctly. The jobs call to a executable of visual BASIC 6, that creates several DTS, to import data of other 6 servers, these DTS import information of text files of UNIX servers. Now with the Windows 2003, the work executes every 2 hours, but it does not do anything. and we have not been able to detect that she is what this happening.

sorry for mi english.