Basement moisture can ruin items you store in the basement. Mold can grow and the spores can spread throughout the entire house, causing allergic reactions and illness. It makes your basement unusable if you are planning to turn it into living space. There are several things you can do to remove the moisture, depending on the severity of the problem.
Step 1: Dehumidifier
If the moisture problem isn't severe, but mostly a damp feeling and a musty smell, a dehumidifier is the answer. It will pull air into it, remove the moisture, and expel dry air. Purchase one appropriate for the amount of square feet of your basement.
Step 2: Waterproof Paint
If the basement moisture is being caused by water seeping through the walls, moisture proof or water barrier paint may be the answer. This can be purchased at any home supply center. Be careful to apply at the rate suggested on the can and have very good ventilation.
Step 3: Complete Waterproofing
If there is a lot of water, or standing water, you will want to consider waterproofing the foundation and basement walls. This is an expensive process that will involve hiring a contractor. The foundation and basement walls will have to be excavated, drain tiles added and waterproofing installed.