When registering a new Integration Service in SSMS, you're can only enter a server name. It won't register the instance. When you are importing/exporting a package to/from one instance to another, enter the server name AND instance in the server list even though it may only supply just the server name. Add the "\" and instance name to the server name as you would say registering a new server instance. You'll get an "OLE DB error 0x80004005 (Client unable to establish connection) occurred while enumerating packages" error. You're not able to log into the server because its name is incomplete.
i had found ONE listing that pointed to the correct resolution: http://social.msdn.microsoft.com/forums/en-US/sqlintegrationservices/thread/8da717ef-05e0-4a59-9a91-a96e29d4dfa6/ Read down about midway to get the answer.