CPU power determines how fast the system functions and runs processes and programmes at the same time, without slowing down the system. Explorer.exe is an executable file in Windows which contains start menu, desktop, task bar and file manager and is essential for the good functioning of the Windows XP operating system. The idle CPU usage for the Windows XP operating system is between 0 and 1 percent. Due to defects or viruses, the Windows operating system calculates the duration of videos on the disks causing the explorer.exe to use CPU resources at their highest usage. To solve this, you need to disable the previews and follow the correct procedure.
The fact that Windows Explorer is using CPU resources at 99% or a 100% may be due to a bug : Windows usually calculates the duration of all videos on the disk, causing the Explorer.exe process to use almost 100% of its CPU or memory resources.
To solve the problem of CPUs at 100%, firstly disable the previews:
Start / Run / regsvr32-u shmedia.dll
Edit the registry (Start / Run / regedit), then delete the following: