I have managed to create a proxy account and assign myself to it but I'm still getting error messages every time I run it. The message now reads:

11/19/2012 10:21:31,AML Data Extract,Error,0,SRVALFASQL,AML Data Extract,(Job outcome),,The job failed. The Job was invoked by User ELSTREE\ssmith. The last step to run was step 1 (Extract).,00:00:01,0,0,,,,0

11/19/2012 10:21:31,AML Data Extract,Error,1,SRVALFASQL,AML Data Extract,Extract,,Executed as user: ELSTREE\ssmith. Microsoft (R) SQL Server Execute Package Utility Version 10.50.2500.0 for 32-bit Copyright (C) Microsoft Corporation 2010. All rights reserved. Started: 10:21:31 AM Error: 2012-11-19 10:21:32.22 Code: 0xC0202009 Source: Package Connection manager "Excel Connection Manager" Description: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005. An OLE DB record is available. Source: "Microsoft JET Database Engine" Hresult: 0x80004005 Description: "'S:\Public\AML_Data_Extract\AML_Data_Extract.xls' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides.". End Error Error: 2012-11-19 10:21:32.22 Code: 0xC020801C Source: AML Conversion - Excel to TXT Excel Source 1 [415] Description: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER. The AcquireConnection method call to the connection manager "Excel Connection Manager" failed with error code 0xC0202009. There may be error messages posted before this with more information on why the AcquireConnection method call failed. End Error Error: 2012-11-19 10:21:32.22 Code: 0xC0047017 Source: AML Conversion - Excel to TXT SSIS.Pipeline Description: component "Excel Source 1" (415) failed validation and returned error code 0xC020801C. End Error Error: 2012-11-19 10:21:32.22 Code: 0xC004700C Source: AML Conversion - Excel to TXT SSIS.Pipeline Description: One or more component failed validation. End Error Error: 2012-11-19 10:21:32.22 Code: 0xC0024107 Source: AML Conversion - Excel to TXT Description: There were errors during task validation. End Error DTExec: The package execution returned DTSER_FAILURE (1). Started: 10:21:31 AM Finished: 10:21:32 AM Elapsed: 0.936 seconds. The package execution failed. The step failed.,00:00:01,0,0,,,,0

I am new to all this and really appreciate any help you can give.

Thanks.