Event 1003 Error code 1000000a blue screen/system fail errors!

I’m using Windows XP since years but recently I have started getting several error messages including this one:

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 24/05/2010
Time: 23:46:49
User: N/A
Computer: CHRISS_ROOM
Description:
Error code 1000000a, parameter1 00000010, parameter2 00000002, parameter3 00000001, parameter4 804dab1b.

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 30 1000000
0020: 61 20 20 50 61 72 61 6d a Param
0028: 65 74 65 72 73 20 30 30 eters 00
0030: 30 30 30 30 31 30 2c 20 000010,
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 34 64 01, 804d
0050: 61 62 31 62 ab1b

Apart from this I also use to get some problem related to my McAfee Security Centre. It has only completed a full scan once
this year without my computer blacking out- the power will just go out and I have to switch off mains switch and switch back on again to restart the system. Anyway, the errors that restart my computer seem to always have something to do with the network adaptor as in event viewer there are constant warning messages such as this one and also warnings related to the following:

Event Type: Warning
Event Source: Dhcp
Event Category: None
Event ID: 1003
Date: 24/05/2010
Time: 23:46:47
User: N/A
Computer: CHRISS_ROOM

Description:
Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 00146CE81884. The following error occurred:

The operation was canceled by the user. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.