Depending on the climate and the source of moisture ventilating the air might be enouch. In Northen Europe (for generally unused and not heated cellars) it works perfectly that for summer windows are covered with a lattice only and for winter closed and warmly isolated. If your home is in more moist place, then Canucksgirl gave a good answer. But there is no way to help it by treating walls from the inside, if any product promises to do that, it's a lie. The moisture will do it's damage somwhere else then.
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Are you sure its mold and not just mineral deposites or crystals. Salt peter forms on the inside of walls if I recall. Its not mold.
You need to identify the cause and source of the moisture and deal with that versus treating the concrete. Do you know if the home has an exterior weeping system? Perhaps it has the old clay pipes and they are damaged. You'll know the answer to this if you are getting moisture in your basement after a rainfall. Unfortunately the solution isn't cheap. The perimeter will need to be dug up and new drainage system installed. Its at that point you can look at adding waterproofing measures to the exterior concrete to prevent any standing water from entering your home. I would advise talking to an expert at this point to determine your specific issue and what remedies you have available.
+1.Deal with the source, then add protection in case that fails.Call before you dig!