How should I address Security Failure Audits in Windows XP that are associated with loss of network connection and possible memory leaks?

My daughter has a Dell Inspiron 8100 laptop running Windows XP Home.  It became very slow and started freezing up due to spyware I think.  I ran AdAware and Spybot to get rid of lots of spyware.  The computer rans faster now, but I still have a problem.  After rebooting the computer, it will run about an hour and then the Event Viewer for Security starts showing "Failure Audits."  I get event ID 529, "unknown user name or bad password". It shows the User Name and Domain as me and my computer.  It also shows:  , "Logon Type 2, Logon Process Advapi; Authentication Package: Negotiate"

I get a  Failure Audit Event ID 680 which shows the User as the "NT Authority/System" on the local computer.  It shows "Logon attempt by MICROSOFT_AUTHENITCATION_pACKAGE_V1_0."

I also get Failure Audit Event ID 615 that shows the category "Policy Change" and the User as 'NT/AUTHORITY/NETWORK SERVICE."  It further states that IPSEec Services failed to get the complete list of network interfaces on the machine."

When these audit failures occur, I get a temporary loss of my network connection for up to about a minute.  Then within another half hour or so, programs on my computer begin hanging up or not responding.

What should I do to address this problem? FYI,  I have run the latest Norton Antivirus and my system appears clean.  Do I even need IPSEC running on my computer if I'm not operating a VPN?
shiraz122397Asked:
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Zaheer IqbalTechnical Assurance & ImplementationCommented:
IPSec is not neeeded on a home network..
Make sure you have an adequate firewall try zonealarm from www.zonelabs.com...
Also visit here for more advice www.blackviper.com on services
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shiraz122397Author Commented:
After removing all non-essential apps and reconfiguring Zone Alarm, the problem went away.
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