my computer suddenly becomes slow and when i look in the task manager, the CPU is running at 100% and EXPLORER.exe is running at 99%. I have to restart it to get it to run normally. Please advise

Explorer.exe Process Uses Many CPU Cycles When Windows Is Idle http://support.microsoft.com/?kbid=317751 To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: How to Obtain the Latest Windows XP Service Pack http://support.microsoft.com/default.aspx?scid=kb;EN-US;322389 The information in this article applies to: Microsoft Windows XP Home Edition Microsoft Windows XP Professional ===================================== 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! ====================================== Cpu usage high If you are experiencing "random" slowdowns and "high" CPU usage for no reason . http://www.blackviper.com/WinXP/supertweaks.htm http://search.atomz.com/search/?sp-q=cpu+100%25&sp-a=sp10025107&sp-advanced=1&sp-p=any&sp-w-control=1&sp-w=alike&sp-d=custom&sp-date-range=-1&sp-start-month=0&sp-start-day=0&sp-start-year=&sp-end-month=0&sp-end-day=0&sp-end-year=&sp-x=any&sp-c=10&sp-m=1&sp-s=0&sp-f=UTF-8 http://search.atomz.com/search/?sp-i=1&sp-q=cpu+100%25&sp-a=sp10025107&sp-advanced=1&sp-p=any&sp-x=any&sp-w-control=1&sp-w=alike&sp-d=custom&sp-n=11&sp-c=10&sp-f=UTF-8 ================================= Explorer.exe Process Uses Many CPU Cycles When Windows Is Idle http://support.microsoft.com/?kbid=317751 To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: How to Obtain the Latest Windows XP Service Pack http://support.microsoft.com/default.aspx?scid=kb;EN-US;322389 The information in this article applies to: Microsoft Windows XP Home Edition Microsoft Windows XP Professional