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[MH32492]

I downloaded the Overlord Pack earlier and have restarted my PC but now when I click Play... I'm getting this message. ''Failed to authentication the disc. Please insert the correct disc and try again" Any ideas on what to do? If I uninstall ME2 and then reinstall, will I have still all of the downloadable content like Cerberus Network and  Kasumi - Stolen Memor?