Just yesterday I have run a custom install of Windows 7 Ultimate x64 and updated to SP1 on my PC but noticed today it has shutdown a few times. Checking the event view displays the four group errors, please could some help resolve this issues? Log Name: System Source: Microsoft-Windows-WER-SystemErrorReporting Date: 26/05/2011 21:35:12 Event ID: 1001 Task Category: None Level: Error Keywords: Classic User: N/A Computer: RJC-PC Description: The computer has rebooted from a bugcheck. The bugcheck was: 0x000000d1 (0xfffff880017546a0, 0x0000000000000002, 0x0000000000000008, 0xfffff880017546a0). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 052611-32245-01. Log Name: Security Source: Microsoft-Windows-Eventlog Date: 26/05/2011 21:35:08 Event ID: 1101 Task Category: Event processing Level: Error Keywords: Audit Success User: N/A Computer: RJC-PC Description: Audit events have been dropped by the transport. 0 Log Name: System Source: Microsoft-Windows-Kernel-Power Date: 26/05/2011 21:34:43 Event ID: 41 Task Category: (63) Level: Critical Keywords: (2) User: SYSTEM Computer: RJC-PC Description: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. Log Name: System Source: EventLog Date: 26/05/2011 21:35:04 Event ID: 6008 Task Category: None Level: Error Keywords: Classic User: N/A Computer: RJC-PC Description: The previous system shutdown at 20:47:25 on ‎26/‎05/‎2011 was unexpected.