--select contentid,config,cast(config as xml) xConfig from contents 

-- Check to see if there are any XML conversion issues.
-- select max(cast(cast(config as xml) as varchar(max))) test from Contents

-- Check for erronious PSI Data
select * from Contents where Config like '%<PSI %'

--Remove PSI Node
--Update Contents Set Config = substring(config,1,charindex('<PSI ',config))+'/Config>' from Contents where Config like '%<PSI %'

--NOTE: First run the entire query, then run just the last line above, then run the entire query again to verify there are none left