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my cpu usage stays at around 80%

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i am using windows xp service pack 2 and intel pentium 4 IBM lenovo thinkcenter.. i found a file in my flash drive that had the icon of a shortcut folder. When i opened it, a DOS window appeared and a few seconds later the speed of my processor increased and the cpu usage was around 80% even though my computer was idle that time. i scanned the system using symantec antivirus and nod 32 but they didnot showed any infected file. After that i installed a new copy of window xp. but it didnt resolved the problem. The cpu usage always stays at around 80%. In windows task manager there is process named ‘nhtoav.exe’ thats using all cpu usage and this process doesnt end.

Please help me with this as this is slowing down my system’s performance and making the processor work unnessesarily and due to it if i attach any removable drive and and then try to safely remove it, i get this message ‘The device ‘Generic volume’ cannot be stopped right now. Try stopping the device later.’ and because of this the data copied in it turns into shortcuts and doesnt open.