Without more information I can only give you some suggestions. First make sure your tires are inflated properly to the manufacturers recommendation. Have the front end alignment checked, especially the toe in/out. Then check the power steering if you have it fluid to make sure it is filled. Try checking the steering cylinder under the car for leaks. If everything checks you most likely have a bad power steering pump, or the steering cylinder seals are letting fluid leak by.
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Without more information I can only give you some suggestions. First make sure your tires are inflated properly to the manufacturers recommendation. Have the front end alignment checked, especially the toe in/out. Then check the power steering if you have it fluid to make sure it is filled. Try checking the steering cylinder under the car for leaks. If everything checks you most likely have a bad power steering pump, or the steering cylinder seals are letting fluid leak by.