I have recently switched out my hard drive and reinstalled Windows Xp due to the fact that I was getting frequent reboots while gaming, related to Event 51 and Event 26. I am now getting the same error. I have even completed a full Hard Drive analysis using Spinrite 6.0 and it reports no errors anywhere on the drive.
The driver has detected that device \Device\Ide\IdePort1 has old or out-of-date firmware. Reduced performance may result.
An error was detected on device \Device\Harddisk0\D during a paging operation.