Every 15 minutes, AVG throws up a box stating it has found an infection - Exploit JavaScript Obfuscation. Help?

Does anyone know what it is and why, even when the computer is not online, this box keeps coming up onscreen, please? This is how it reads in the address line: "Exploit JavaScript Obfuscation";"wrksqumczgeilnapirro.cn/s_t_t.php";"";"12/03/2009,... show more Does anyone know what it is and why, even when the computer is not online, this box keeps coming up onscreen, please? This is how it reads in the address line:

"Exploit JavaScript Obfuscation";"wrksqumczgeilnapirro.cn/s_... 14:00:32";File";"C:\WINDOWS\system32\msh...

This has been happening for more than a month and Malwarebytes and Superantispyware scans show no infections, but it continues to happen? We seem to have a gremlin in the works somewhere!

It doesn't go into the virus vault but shows up in Web Shield Findings.

Does anyone know how to get rid of this, please.

Thanx.
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