See if any of these help .
There's a bug in XP that can cause your CPU to go to 100% and other operations (such as copying files, network connections or streaming audio/video) to suffer degraded performance when you right click a file or folder. Want to know why it happens and how you can work around it? See KB article 819101 at
http://www.winxpnews.com/rd/rd.cfm?i...CO-Right_Click
http://support.microsoft.com/?kbid=819101
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Clicking AVI Files on explorer causing 100% CPU Usage
http://www.computerbastion.com/xpfixes.htm
http://www.windowsxpatoz.com/cgi-bin...&id=1036282433
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High cpu loads in idle condition .
http://www.computerbastion.com/xpfixes.htm
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Try performing an advanced clean-boot of XP to isolate the problem:
http://support.microsoft.com/default.aspx?kbid=316434
http://support.microsoft.com/default.aspx?kbid=310353
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There are four services associated with lsass.exe and most users (especially home
users) do not need any of them running.
They are:
IPSEC services
Net Logon
NT LM Security Support Provider
Protected Storage
Type "services.msc" in run , press Enter and disable them.
I suggest you visit the following URL for complete info:
http://www.blkviper.com/WinXP/servicecfg.htm
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Disable Indexing Services
http://www.tweakxp.com/tweakxp/display.asp?id=1335
http://mywebpages.comcast.net/SupportCD/OptimizeXP.html
Indexing services is a small program that hogs HUGE amounts of RAM and can often make a computer endlessly loud and noisy. This system process indexing and updates lists of the files on your system, so you can search for them quickly, but it's completley unnessesary.
To disable it, go to the Control Panel and click Add/Remove Programs. Click the Add/Remove Window Components. Simply unclick the Indexing services and click next!