Michael Austin Seward of Deerfield Beach and Kevin James McCormick of Delray Beach admitted Wednesday they operated a scam called Client Care Experts.
Prosecutors alleged the 32-year-old Seward and the 46-year-old McCormick used pop-up advertisements that looked like system warnings of viruses and malware.
The ads caused the computers to freeze and directed the owners to call a toll-free number, which connected them to a sales representative who continued the fraud by seizing control of the computer and selling remote "tune-up" and anti-virus software.
Federal prosecutors say the scam, which operated nationwide and in several countries from 2013 to 2016, took in over $25 million.
Seward and McCormick are scheduled to be sentenced Nov. 18.
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