Odd security entries on my main PC

Log Name:      SecuritySource:        Microsoft-Windows-Security-Auditing
Date:          6/25/2013 9:28:37 PM
Event ID:      4624
Task Category: Logon
Level:         Information
Keywords:      Audit Success
User:          N/A
Computer:      ASUS-PC
Description:
An account was successfully logged on.


Subject:
    Security ID:        SYSTEM
    Account Name:        ASUS-PC$
    Account Domain:        WORKGROUP
    Logon ID:        0x3E7


Logon Type:            5


Impersonation Level:        Impersonation


New Logon:
    Security ID:        SYSTEM
    Account Name:        SYSTEM
    Account Domain:        NT AUTHORITY
    Logon ID:        0x3E7
    Logon GUID:        {00000000-0000-0000-0000-000000000000}


Process Information:
    Process ID:        0x2a0
    Process Name:        C:\Windows\System32\services.exe


Network Information:
    Workstation Name:    
    Source Network Address:    -
    Source Port:        -


Detailed Authentication Information:
    Logon Process:        Advapi  
    Authentication Package:    Negotiate
    Transited Services:    -
    Package Name (NTLM only):    -
    Key Length:        0


This event is generated when a logon session is created. It is generated on the computer that was accessed.


The subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.


The logon type field indicates the kind of logon that occurred. The most common types are 2 (interactive) and 3 (network).


The New Logon fields indicate the account for whom the new logon was created, i.e. the account that was logged on.


The network fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.


The impersonation level field indicates the extent to which a process in the logon session can impersonate.


The authentication information fields provide detailed information about this specific logon request.
    - Logon GUID is a unique identifier that can be used to correlate this event with a KDC event.
    - Transited services indicate which intermediate services have participated in this logon request.
    - Package name indicates which sub-protocol was used among the NTLM protocols.
    - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
    <EventID>4624</EventID>
    <Version>1</Version>
    <Level>0</Level>
    <Task>12544</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8020000000000000</Keywords>
    <TimeCreated SystemTime="2013-06-26T04:28:37.928916400Z" />
    <EventRecordID>2936062</EventRecordID>
    <Correlation />
    <Execution ProcessID="688" ThreadID="712" />
    <Channel>Security</Channel>
    <Computer>ASUS-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="SubjectUserSid">S-1-5-18</Data>
    <Data Name="SubjectUserName">ASUS-PC$</Data>
    <Data Name="SubjectDomainName">WORKGROUP</Data>
    <Data Name="SubjectLogonId">0x3e7</Data>
    <Data Name="TargetUserSid">S-1-5-18</Data>
    <Data Name="TargetUserName">SYSTEM</Data>
    <Data Name="TargetDomainName">NT AUTHORITY</Data>
    <Data Name="TargetLogonId">0x3e7</Data>
    <Data Name="LogonType">5</Data>
    <Data Name="LogonProcessName">Advapi  </Data>
    <Data Name="AuthenticationPackageName">Negotiate</Data>
    <Data Name="WorkstationName">
    </Data>
    <Data Name="LogonGuid">{00000000-0000-0000-0000-000000000000}</Data>
    <Data Name="TransmittedServices">-</Data>
    <Data Name="LmPackageName">-</Data>
    <Data Name="KeyLength">0</Data>
    <Data Name="ProcessId">0x2a0</Data>
    <Data Name="ProcessName">C:\Windows\System32\services.exe</Data>
    <Data Name="IpAddress">-</Data>
    <Data Name="IpPort">-</Data>
    <Data Name="ImpersonationLevel">%%1833</Data>
  </EventData>
</Event>

Log Name:      SecuritySource:        Microsoft-Windows-Security-Auditing
Date:          6/25/2013 7:49:22 PM
Event ID:      4634
Task Category: Logoff
Level:         Information
Keywords:      Audit Success
User:          N/A
Computer:      ASUS-PC
Description:
An account was logged off.


Subject:
    Security ID:        ANONYMOUS LOGON
    Account Name:        ANONYMOUS LOGON
    Account Domain:        NT AUTHORITY
    Logon ID:        0x288977F


Logon Type:            3


This event is generated when a logon session is destroyed. It may be positively correlated with a logon event using the Logon ID value. Logon IDs are only unique between reboots on the same computer.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
    <EventID>4634</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12545</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8020000000000000</Keywords>
    <TimeCreated SystemTime="2013-06-26T02:49:22.661049800Z" />
    <EventRecordID>2935956</EventRecordID>
    <Correlation />
    <Execution ProcessID="652" ThreadID="1372" />
    <Channel>Security</Channel>
    <Computer>ASUS-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="TargetUserSid">S-1-5-7</Data>
    <Data Name="TargetUserName">ANONYMOUS LOGON</Data>
    <Data Name="TargetDomainName">NT AUTHORITY</Data>
    <Data Name="TargetLogonId">0x288977f</Data>
    <Data Name="LogonType">3</Data>
  </EventData>
</Event>