My father's computer has Windows XP, but when I try to install the service packs it always fails. What gives?

Here are the errors that I get in the event log:

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Date: 2/6/2010 Time: 12:02:18 AM Type: Error User: N/A Computer: EVO Source: Windows Update Agent Category: Installation Event ID: 20

Installation Failure: Windows failed to install the following update with error 0x80070002: Security Update for Windows XP (KB946648).

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

0000: 57 69 6e 33 32 48 52 65   Win32HRe
0008: 73 75 6c 74 3d 30 78 38   sult=0x8
0010: 30 30 37 30 30 30 32 20   0070002 
0018: 55 70 64 61 74 65 49 44   UpdateID
0020: 3d 7b 38 33 44 31 41 44   ={83D1AD
0028: 46 35 2d 37 37 39 44 2d   F5-779D-
0030: 34 30 31 36 2d 38 43 33   4016-8C3
0038: 31 2d 35 34 39 32 37 30   1-549270
0040: 46 36 37 42 33 46 7d 20   F67B3F} 
0048: 52 65 76 69 73 69 6f 6e   Revision
0050: 4e 75 6d 62 65 72 3d 31   Number=1
0058: 30 34 20 00               04 .    

---

Date: 2/6/2010 Time: 12:02:18 AM Type: Error User: N/A Computer: EVO Source: Windows Update Agent Catagory: Installation Event ID: 20

Installation Failure: Windows failed to install the following update with error 0x80070002: Security Update for Windows XP (KB956572).

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

0000: 57 69 6e 33 32 48 52 65   Win32HRe
0008: 73 75 6c 74 3d 30 78 38   sult=0x8
0010: 30 30 37 30 30 30 32 20   0070002 
0018: 55 70 64 61 74 65 49 44   UpdateID
0020: 3d 7b 44 46 32 46 30 41   ={DF2F0A
0028: 39 38 2d 36 45 33 35 2d   98-6E35-
0030: 34 33 37 39 2d 41 42 33   4379-AB3
0038: 33 2d 41 30 33 30 33 45   3-A0303E
0040: 46 37 34 42 32 41 7d 20   F74B2A} 
0048: 52 65 76 69 73 69 6f 6e   Revision
0050: 4e 75 6d 62 65 72 3d 31   Number=1
0058: 30 32 20 00               02 .    

---

Date: 2/6/2010 Time: 12:02:18 AM Type: Error User: N/A Computer EVO Source: Windows Update Agent Event ID: 20

Installation Failure: Windows failed to install the following update with error 0x80070002: Security Update for Windows XP (KB958644).

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

0000: 57 69 6e 33 32 48 52 65   Win32HRe
0008: 73 75 6c 74 3d 30 78 38   sult=0x8
0010: 30 30 37 30 30 30 32 20   0070002 
0018: 55 70 64 61 74 65 49 44   UpdateID
0020: 3d 7b 39 33 39 37 41 32   ={9397A2
0028: 31 46 2d 32 34 36 43 2d   1F-246C-
0030: 34 35 33 42 2d 41 43 30   453B-AC0
0038: 35 2d 36 35 42 46 34 46   5-65BF4F
0040: 43 36 42 36 38 42 7d 20   C6B68B} 
0048: 52 65 76 69 73 69 6f 6e   Revision
0050: 4e 75 6d 62 65 72 3d 31   Number=1
0058: 30 31 20 00               01 .    

---

Date: 2/6/2010 Time: 12:02:18 AM Type: Error User: N/A Computer: EVO Source: Windows Update Agent Category: Installation Event ID: 20

Installation Failure: Windows failed to install the following update with error 0x80070002: Security Update for Windows XP (KB923561).

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

0000: 57 69 6e 33 32 48 52 65   Win32HRe
0008: 73 75 6c 74 3d 30 78 38   sult=0x8
0010: 30 30 37 30 30 30 32 20   0070002 
0018: 55 70 64 61 74 65 49 44   UpdateID
0020: 3d 7b 33 31 30 41 34 43   ={310A4C
0028: 30 38 2d 35 39 33 44 2d   08-593D-
0030: 34 31 41 33 2d 42 42 35   41A3-BB5
0038: 37 2d 38 33 42 33 38 36   7-83B386
0040: 44 37 37 33 42 35 7d 20   D773B5} 
0048: 52 65 76 69 73 69 6f 6e   Revision
0050: 4e 75 6d 62 65 72 3d 31   Number=1
0058: 30 33 20 00               03 .    

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Thank you, Andrew