Although I have covered various aspects of this problem previously, suggestions are worth repeating, and some new product information, which can help you combat this problem, is worth passing along. Before dealing with your basement interior, a thorough inspection of your house exterior and foundation is essential. Make sure all outside gutters and drains are free of leaves and debris. Check for any leaks in downspouts and gutter seams. Make sure that the gutter drains carry water away from your house.
Rainwater trapped near foundations is a major source of moisture problems.
The ground should be sloped so that water flows easily away from the house. If necessary, fill in low spots around the foundation with gravel and soil, caulk around basement windows, extend downspouts, replace splash blocks. Water pressure, or hydrostatic pressure, is caused by water being trapped between the soil and wall, pushing against the foundation, and entering through the basement's foundation wall. Once you are satisfied that you've directed water away from the house, you're ready to begin your project inside the basement. Proper preparation of your walls, whether they are poured concrete or concrete block, is essential prior to waterproofing.