Windows XP Home SP3 Celeron CPU 2GB memory Two page files: C:\pagefile.sys 2,096,624 KB and G:\pagefile.sys 2,096,624 KB C and G are separate physical drives. Each is between 2 and 4 years old. Every few weeks, I get a bugcheck F4,3: Example: STOP: F4, 3, 89A81020 89A81194, 805FB1D6 I run Microsoft memory diag and TUFFTest memory diag: no errors. I have not tried moving the page files. Minidumps from 26 Sept and 20 Oct attached. The probable cause is csrss.exe. The csrss.exe file is 6KB in \Windows\system32. Is there a way I can find out what failed while csrss.exe was running?