How to remove Trojan-GameThief.Win32.Magania.aigw

I am really fed up with this and am trying to remove Trojan-GameThief.Win32.Magania.aigw so called virus. I am running it on Windows Vista Home. I have scanned this virus through AVG Free and it refers that it has removed it but dont know after scanning back, this virus comes back. So I really need some favor from you guys for help.

Thank you in advance

Download UsbFix on your desktop

Start the installation with the default settings

Open your external data sources to your PC (USB flash drive, external hard drive, etc ...) d likely have been infected without opening

Double-click the shortcut on your desktop UsbFix

The pc will reboot

After reboot post the report UsbFix.txt

Note: UsbFix.txt the report is saved in the root disk

From Kaspersky forums:

Run this script, PC will reboot.

Code:

---

begin
SetAVZGuardStatus(True);
SearchRootkit(true, true);
QuarantineFile('E:\xih9.cmd','');
QuarantineFile('E:\autorun.inf','');
QuarantineFile('C:\xih9.cmd','');
QuarantineFile('C:\autorun.inf','');
DeleteFile('C:\autorun.inf');
DeleteFile('C:\xih9.cmd');
DeleteFile('E:\autorun.inf');
DeleteFile('E:\xih9.cmd');
BC_ImportDeletedList;
ExecuteSysClean;
BC_Activate;
RebootWindows(true);
end.

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Dont know whether it works for AVG though but might give a try.