1. A computer-implemented method for performing a trusted search, the method comprising: prompting a user to select from categories of trust criteria; prompting the user to enter parameters related to the selected categories of trust criteria; storing, in memory, the selected categories and the parameters of trust criteria; assigning a credibility score to a Web site based on whether the Web site meets at least a portion of the trust criteria; storing, in memory, the Web site in an index of trusted Web sites if the credibility score assigned to the Web site is within a predefined range of credibility scores; displaying the Web site on a machine if the Web site is determined to contain information that is relevant to a search query; and wherein displaying the Web site further comprises displaying the Web site on the machine only if the credibility score of the Web site lies within a confidence range of credibility scores, the confidence range including a portion of the predetermined range.