You haven't provided very much information. There really is no single file that might solve any problems you have. This is likely a power management issue. Is this an error message of some kind?
I suggest you check with the system or motherboard manufacturer WEB site for possible drivers. Particulalrly if your system is a white box system.
I have the same problem with a Dell 4500. The SM Bus Controller in Other Devices (in the Devise Manager) has a yellow question mark by it. When I try to reinstall the driver from the WindowsXP CD, it cannot be located. When I try installing from the web, it cannot be found there either.
My computer seems to be operating okay, it just bugs me to have a inoperable device showing in Device Manager. I called Dell, and the tech suggested reformatting the hard drive and reinstalling XP. I told him "No thanks"
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