NEW YORK (CNN) – 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" - similar to a virus.
PCs infected with DNS Changer were used by a group of hackers for fraud.
Federal agents said 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 visiting FBI.gov and searching for "DNS changer."
links to check computers: