EVENT ID 1003 - PC constantly reboots

[Tgarrigues]

My PC is consistantly reboots itself and I find the below in my event viewer. Never quite the same error codes and it is random. I have attached 3 "minidump" files that I discovered in trying to troubleshoot this error. Let me know if I can provide any additional info or if you have some insight to this problem. Thanks in advance!

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 4/20/2006
Time: 10:01:15 PM
User: N/A
Computer: BRAD
Description:
Error code 100000c5, parameter1 00000000, parameter2 00000002, parameter3 00000001, parameter4 805509e9.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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 31 30 30 30 30 30 63 100000c
0020: 35 20 20 50 61 72 61 6d 5 Param
0028: 65 74 65 72 73 20 30 30 eters 00
0030: 30 30 30 30 30 30 2c 20 000000,
0038: 30 30 30 30 30 30 30 32 00000002
0040: 2c 20 30 30 30 30 30 30 , 000000
0048: 30 31 2c 20 38 30 35 35 01, 8055
0050: 30 39 65 39 09e9

OR
Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 4/17/2006
Time: 10:29:26 PM
User: N/A
Computer: BRAD
Description:
Error code 000000c2, parameter1 00000007, parameter2 00000cd4, parameter3 00001052, parameter4 86015008.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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 63 000000c
0020: 32 20 20 50 61 72 61 6d 2 Param
0028: 65 74 65 72 73 20 30 30 eters 00
0030: 30 30 30 30 30 37 2c 20 000007,
0038: 30 30 30 30 30 63 64 34 00000cd4
0040: 2c 20 30 30 30 30 31 30 , 000010
0048: 35 32 2c 20 38 36 30 31 52, 8601
0050: 35 30 30 38 5008

OR

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 4/17/2006
Time: 1:22:47 PM
User: N/A
Computer: BRAD
Description:
Error code 1000008e, parameter1 c0000005, parameter2 80571035, parameter3 b85fcbb4, parameter4 00000000.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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 31 30 30 30 30 30 38 1000008
0020: 65 20 20 50 61 72 61 6d e Param
0028: 65 74 65 72 73 20 63 30 eters c0
0030: 30 30 30 30 30 35 2c 20 000005,
0038: 38 30 35 37 31 30 33 35 80571035
0040: 2c 20 62 38 35 66 63 62 , b85fcb
0048: 62 34 2c 20 30 30 30 30 b4, 0000
0050: 30 30 30 30 0000

**Update** I have ran Norton's diagnostic tools and it tells me my hard disk and memory are both good. Anyone any suggestions yet?