The U.S. Department of Homeland Security has sent out an urgent alert advising Windows users to uninstall Apple’s QuickTime program, the video and audio software (once) widely used to play movie trailers and other Internet media clips, due to two major vulnerabilities in the program that can allow hackers into people’s computers.

Apple has been periodically fixing bugs in QuickTime over the past several years. but Apple has pulled support for QuickTime on Windows, and their last update for the product came in late January 2016.

QuickTime for Windows will continue to work and is still available for download, but Apple and the DHS have urged Windows users to uninstall the program.

“Using unsupported software may increase the risks from viruses and other security threats,” DHS said in their alert. “The only mitigation available is to uninstall QuickTime for Windows.”

Over the past several years, QuickTime has largely been supplanted by online media platforms such as YouTube, Facebook and Netflix.