Depends on what country your coming from. You can come to the US for a limited of time of a travelers visa, but if you want to work or live permanently thats a different story.
Go to this website:
Never heard of an “investors visa.” You can go to the website of the embassy of the U.S. to your country. Look under visas. Some nationalities may come to the U.S. for up to 90 days without a visa. Others must apply for a tourist or business visa. All options will be explained on that website. If you must have a visa, to come to the U.S., you must fill out the 0n-line application, print it out, CALL the nearest embassy , and make an appointment for an interview.