Trojan: JS/Medfos.B

[System]

Trojan: JS/Medfos.B has just appeared on my laptop. The Microsoft Essentials program is picking it up and quarantining it, but every time I delete the virus, it reappears. Microsoft Essentials finds it again, I delete it. It's a vicious circle. How do
I get rid of it for good?HELP HELP HELP.

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