WASHINGTON, DC (WUSA) -- Personal assistant Jake Lewis is on the Internet for more than 15 hours a day.

He was alarmed to hear about the computer virus that could knock thousands of people offline.

"I have all of my documents, my database, all stored online. That's contacts, that's scheduling, that's references," he says.

FBI agents busted a ring of computer hackers in Estonia last year.

The scam infected hundreds of thousands of computers around the world and controlled them through rouge servers.

The hackers would redirect people to different websites and rack up millions of dollars in illegal fees.

TheFederal Bureau of Investigation set up alternative systems to keep the more than 60,000 computers online. But, it shuts down on Monday, July 9 and they will be cut off.

The FBI is directing users to a special website to see if they're infected. It is www.dcwg.org.

DNS Malware: Is Your Computer Infected?

The site checks for the virus and tells you how to fix it.

Jake Lewis is fortunate. He is in the clear.

"I'm very relieved knowing I won't lose my Internet on Monday. Thank God," he says.

But, the FBI thinks many others, including 50 major U.S. corporations, are infected and at risk.

Register As A Victim Of DSN Malware

The virus is what's called malware or malicious software. It can affect both Macs and PCs.

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