UNDATED — Tens or even hundreds of thousands of computer users could be unable to get online this summer.
The FBI is warning all computer owners to check for a type of malware called "DNS Changer" that is similar to a virus.
PCs infected with DNS Changer were used by a group of hackers for fraud. Federal agents say they've caught those responsible.
But a temporary solution keeping the infected machines online will go away in July, and users won't be able to connect to the internet.
You can check your computer by going to this link.