There's really no way to compare two computers running two different operating systems, Web browsers, or any other type of program and definitively say which one is more secure. That makes it hard for governments and businesses to decide how best to spend money on security-or even how much they should spend in the first place. It's difficult to know whether a security product is effective or just has good marketing.rnConsider virus scanners. They automatically examine files for malicious software, but they can only detect mal-ware that's already been identified. So a scanner can't say that a computer system has zero viruses-it can just say that a system doesn't have any of the viruses the scanner was designed to catch.
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