FYI, I have confirmed on two different instances of 64-bit SQL 2008 R2 SP2 that WITHOUT Integration Services installed you can run an SSIS Package from SQL Agent that imports data from text files to SQLServer. But you cannot import from Access files. I suspect the text import share componets with BCP which is part of the base install?
After running setup and adding Integration Services, as well as AccessDatabaseEngine (from http://www.microsoft.com/en-us/download/details.aspx?id=13255
) , I can now run a SSIS package that imports from both text and Access files.