This problem occurs because the system incorrectly sends certain nonmaskable interrupts. When there are more than 8 logical processors that are available, some logical processors do not receive the nonmaskable interrupt that instructs the computer to restart. You can fix this issue by downloading the hotfix file from the Microsoft websiteand executing it.
Before starting to recognize which model of Athlon XP CPU you're using, do you know how many models AMD Athlon XP has? There are three models: Palomino, Thoroughbred, and the newest one, Barton. Please note that Thoroughbred CPU has two types of FSB speed, 266 and 333MHz.
OK, there is a simple way guiding you to identify your Athlon XP CPU model: