(WTVR) - 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," which 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.
However, 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 visiting: