cant delete

I cant delete some rows from my sql 2008 express DB from sql server MS .

I get a cant delete due to truncate data error? I have no idea why this i happening as I can delete some rows and not others. I just right click on a row and click delete. I set the table up with defaults with data types like int and text, varchar...

I have admin rights to the DB remotely hosted

I have a table with 6 fields  wth a PK.

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
can you please show the exact error?
do you have any triggers on the table?
can you plz generate the create table script and show us?
May be there are foreign keys in other tables, that reference rows in your table?
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jagguyAuthor Commented:
I dont have triggers, or foreign keys set , i am using Management system not scripts,

Even when i try to read the data I get

Error source:system data
Error message :invalid attempt to call read when reader is closed

the data is then listed and i have problem deleting data with the mouse right click. error
Guy Hengel [angelIII / a3]Billing EngineerCommented:
do you have any instance-level triggers?

the error cannot come from a DELETE, only from UPDATE or INSERT
jagguyAuthor Commented:
the error came from a delete and i dont know what a instance-level trigger is .

I just right click and delete the current row
Guy Hengel [angelIII / a3]Billing EngineerCommented:
instance triggers (or DDL triggers) can catch any operations:

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Microsoft SQL Server 2008

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