Best to get an expert to confirm the diagnosis. Causes of damp are not always "rising damp" - Can be bridged damp proof course, rainwater goods, leaks, condensation etc.
If you do decide to do yourself and does need a new damp proof course then easy method is to inject new dpc using a dpc cream injection system - plenty about these days - start off here: www.i-sells.co.uk/dpc-cream
galco247
August 2009