What do you do when you see this error in SQL Server 2005?

Look further down the error message and you may notice something like this... "Could not set \Package\Job.Disable value to false"

This is usually caused by the dynamic linked library (dll) dts.dll becoming unregistered. Whether due to an in-place upgrade or service pack install, even some hot fixes may cause this. Never fear though - crack open a DOS prompt or Start->Run and issue the following command

regsvr32 dts.dll

You should receive a message from the OS stating that the dll was successfully registered. Try to run your job again and you should find that it runs this time.