Published: Jul 07, 2012 7:32 PM EDT

Malware Monday is looming. Are you and your computer prepared?

Tens of thousands of Americans could lose their Internet service Monday unless they do a quick check of their computers for malware. That's because several years ago hackers sent out a debilitating virus that affected users worldwide.  

For a quick check on your system, all you have to do is go this website:

Experts say it's always a good idea to install antivirus software and to keep it up to date. Also, a lot of viruses can be prevented if your computer's operating software is up to date.