Here's what Mr Darric Hor, general manager of Symantec in Singapore and Indonesia, says you should do:

"If your PC starts slowing to a crawl, going to unknown sites, suddenly shutting down, or not working at all, you might be a victim.

- Run virus checks with your anti-virus software Infected users who do not have anti-virus software can search for removal tools online.

- Once the threat is removed, install an anti-virus program.

- Delete suspicious e-mail messages and keep software and security patches up-to-date."

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