Last spring amy fenollosa's brand-new Dell laptop morphed into an unruly ad-blasting ma-As she watched helplessly, screen filled over and over with pop-up promotions for travel deals, cheap mortgages, pornography and—in a bitter twist—tools to help her get rid of unwanted ads. "The pop-ups came incessantly," she says. "I couldn't even open the Web browser or restart my computer. It made me crazy." She brought the laptop to two computer stores before a tech rep at Best Buy finally wiped her hard drive clean and told her to start from scratch.
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