Action Steps for a Virus Attack

Call a PC guru and don't shut off your PC which could trigger the infection.

Disconnect your online connection.

Back up any new data, it might be your only chance. Try to clean it later.

Use another PC to learn about the virus.

Use anti-virus software to scan and clean. If not treatable, delete the file.

Brief your anti-virus software vendor, in case it's an new virus.