If your country does not participate in the VWP, you must
obtain a B-1 (business) or B-2 (tourist) visa before
entering the US. Information on the B-1 and B-2 visas can be
found at the
U.S. State Department:
(http://travel.state.gov/visa/temp/types/types_2664.html) .
Please note that obtaining a B-1 or B-2 visa can be a
lengthy process, so begin the process of obtaining a visa
soon.