The federal regulator says Pecon Software Ltd. and Avaneesh Software Private Ltd. were making unsolicited telemarketing calls to Canadians who had registered their phone numbers on the national do-not-call list.
The CRTC says the telemarketers would warn people their home computer was infected with a virus and offer to sell them online technical support or anti-virus software.
The regulator says the callers would sometimes also request remote access to the "infected" computers.
Pecon has been fined $495,000, while Avaneesh has been fined $12,000.
The CRTC has also ordered both companies to stop making the calls.