Brian Grayek, vice president of security company CA, says that users can sometimes detect a slowdown in performance, hear their PC's hard drive whirring or see their Internet router's lights flashing when they're not using the computer, all signs that zombie software is at work.

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Brian Grayek, vice president of security company CA (nyse: CA - news - people ), says that users can sometimes detect a slowdown in performance, hear their PC's hard drive whirring or see their Internet router's lights flashing when they're not using the computer, all signs that zombie software is at work.

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