The FBI has a warning for computer users: Be on the lookout for malware or you may be without Internet access starting Monday.
Software called DNS Changer may infect thousands of unprotected users on Monday.
Security experts say infected computers probably got the DNS Changer through email attachments or by clicking infected links.
It's estimated that more than 45,000 computer users in the United States alone have the virus.
To find out if your computer is infected, you can head to:
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