Event ID 1003 and Event 1076

[laz21]

I have a server running Server 2003 x64 and SQL Server 2005. There has been a problem with the server rebooting and it has become fairly frequent. All help is appreciated.

The first error is one that appears throughout the log but at different times from the ID 1003 and ID 1076.

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 26/06/2009
Time: 03:11:48 p.m.
User: N/A
Computer: SERVERVEN2
Description:
Error code 0000000000000050, parameter1 fffffa8000a5d000, parameter2 0000000000000000, parameter3 fffff800012e91cc, parameter4 0000000000000000.

For more information, see Help and Support Center at
Data:
0000: 53 79 73 74 65 6d 20 45 System E
0008: 72 72 6f 72 20 20 45 72 rror Er
0010: 72 6f 72 20 63 6f 64 65 ror code
0018: 20 30 30 30 30 30 30 30 0000000
0020: 30 30 30 30 30 30 30 35 00000005
0028: 30 20 20 50 61 72 61 6d 0 Param
0030: 65 74 65 72 73 20 66 66 eters ff
0038: 66 66 66 61 38 30 30 30 fffa8000
0040: 61 35 64 30 30 30 2c 20 a5d000,
0048: 30 30 30 30 30 30 30 30 00000000
0050: 30 30 30 30 30 30 30 30 00000000
0058: 2c 20 66 66 66 66 66 38 , fffff8
0060: 30 30 30 31 32 65 39 31 00012e91
0068: 63 63 2c 20 30 30 30 30 cc, 0000
0070: 30 30 30 30 30 30 30 30 00000000
0078: 30 30 30 30 0000

Event Type: Warning
Event Source: USER32
Event Category: None
Event ID: 1076
Date: 26/06/2009
Time: 03:11:31 p.m.
User: INTRAVEN\adm.lzafra
Computer: SERVERVEN2
Description:
The reason supplied by user INTRAVEN\adm.lzafra for the last unexpected shutdown of this computer is: System Failure: Stop error
Reason Code: 0x805000f
Bug ID:
Bugcheck String: 0x00000050 (0xfffffa8000a5d000, 0x0000000000000000, 0xfffff800012e91cc, 0x0000000000000000)
Comment: 0x00000050 (0xfffffa8000a5d000, 0x0000000000000000, 0xfffff800012e91cc, 0x0000000000000000)

....