It looks like a legitimate warning message telling you that your computer is infected with a virus! Many people would assume that this is legitimate and click one of the buttons to ‘clean’ their computer.
They would be wrong on both counts. Now their computer really is infected with a virus.
My advice? Shut down the computer immediately, don’t use it, and give me a call right away.
It may take a lot of work to fix, but losing your hard work is worse. Call me! I can help.