Moisture may or may not be coming through the foundation.
You did not give any details of your climate or the construction.
But in may parts of the country summers are very humid.
And basement, by there nature are relatively cool. That cause the RH to increase and and can lead to mold and mildew.
One of the ways to control it is to reduce head loses through the foundation. Also a vapor RETARDER (NOT BARRIER) will help.
Sheets of foam attached directly to the foundation can provide both features.
Start with this;
http://www.buildingscience.com/resources/moisture/relative_humidity_0402.pdf
And the ones here on basement insulation.
http://www.buildingscience.com/resources/foundations/default.htm
And you can get some same details here.
http://www.buildingscience.com/designsthatwork/default.htm
You have to look at what region you are in and them look at house with basements.
Depending on all of the details you might also need a dehumdifier.
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