I've got such a file indeed in my Windows XP. It's 67 kB (but that might vary a little bit between languages).
Is your file missing? Or is it corrupt? Only you can tell what's on your machine, I can't, because I can't run Windows Explorer on it.
In both cases running sfc /scannow or a repair install of Windows XP might return a correct version. And - if the error message is correct - that would solve the problem.
It's strange that a few hours without power solves this problem. It could be hardware related, especially on an older machine as you have.
Kees
Kees
Most of the time if I shut down my computer from the proper place using the "shut down" or the "restart" options,when I try to start it up again,it won't boot and this message comes up: "Windows could not start up because the following file is either missing or corrupt:
System32\DRIVERS\pci.sys" .I have tried using F8 and trying another way,but it doesn't work either.The only thing that gets me back on is to unplug it and leave it for several hours.I have tried going to "msconfig" and trying the options there but when it restarts,it does the same thing again. I have a 533mhz Intel Celeron processor and XP Professional with Service Pack.What can I do? The only way I can shut down is to hibernate.Anything that requires restarting the computer usually can't be done.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic