from : http://www.somelifeblog.com/2007/05/fixed-windows-xp-explorerexe-100-cpu.html
A couple of days ago, I posted the fixes I ran into with performance problems with Windows XP and svchost.exe. Since that time, the site has received a number of visits from folks experiencing that issue. In addition, I have received a number of emails regarding similar problems with the Windows XP EXPLORE.EXE (not iexplore.exe) using high amounts of CPU or processor time, even running at 100%.
Because of that, I put together a short guide on the top problems that are run into with Windows XP, regardless of the edition: Windows XP Home Edition, Windows XP Professional, Service Pack 1 (SP1), and Service Pack 2 (SP2). Here are the most common issues with the EXPLORER.EXE process consuming 100% CPU. Hopefully they solve your problems!
Virus or Spyware. This the first that that everyone points to whenever there is a problem. A couple of tools that I recommend is Grisoft's AVG Free Edition. It is a completely free and effective virus prevention software. For spyware, check out Spybot Search & Destroy -- it's an effective way to remove Spyware.
Windows Explorer configuration. Configure the Windows XP process explore.exe to be the most efficient. First open Windows Explorer. Next, click on Tools --> Folder Options. Click on the 'View' tab. Make sure to uncheck 'Automatically search for network folders and printers' and check 'Launch folder windows in a separate process'. Click on 'Apply'. Click on 'Apply to All Folders'. Click 'Ok'.
Winzip or zip functionality in Windows. Sometimes by re-registering a .dll in the Microsoft Windows XP system will fix the issue. Go to Start --> Run and enter the following command: "regsvr32 C:\windows\system32\zipfldr.dll /u"
There may be a bug in Windows XP that causing Windows Explorer (explore.exe) to read the entire contents of broken AVI files before allowing any access, caused by issues shmedia.dll. This problem causes Windows Explorer to read the entire contents of an AVI file, regardless of its size or location any time the mouse pointer is hovered over it, or an attempt is made to access it through Windows Explorer. This causes 'permission denied' errors when trying to simply move, copy or delete these files as they cannot be changed while Explorer has an open handle on them. To correct this misbehavior in Windows XP, remove the following registry key. HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{87D62D94-71B3-4b9a-9489-5FE6850DC73E}\InProcServer32
This will prevent Explorer from loading shmedia.dll in response to file property queries on these files. This will not affect your ability to play files, get file attributes, or even view thumbnails. This tends to resolve explorer.exe 100% CPU issues.
Another path to this fix includes resetting the values for the following two registry keys, HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{87D62D94-71B3-4b9a-9489-5FE6850DC73E}\InProcServer32 - shmedia.dll & HKEY_CLASSES_ROOT\SystemFileAssociations\.avi\shellex\PropertyHandler. Open up regedit. Next go to HKEY_CLASSES_ROOT\SystemFileAssociations\.avi\shellex\PropertyHandler. Then change the "Default" value which should be "87D62D94-71B3-4b9a-9489-5FE6850DC73E" to "0". Finally, reboot.
Hopefully these fixes will solve your Windows XP issues! This article was accurate at the time it was posted and the poster makes no warranties or guarantess about the contents of this article.
Did this solution work for you? Please let me know with a comment!
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