Explorer.exe is a process in Windows that handles the running of Windows Explorer and is part of the Windows GUI shell. This is the graphical interface you use when browsing files and folder on your computer and hard drives and should not be terminated as other processes may need it to function.
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What Causes the High CPU Usage Explorer.exe Error?
The common cause of this error is that some type of malware has entered your computer and has taken the name of explorer.exe to deceive unsuspecting users. A common indicator for an infection is that when you boot your system everything loads fine, but suddenly all the icons and other desktop properties disappear, leaving only your background visible, and then reappears after a few seconds.
The virus in question is a Trojan that infects the system and takes the name of safe files and processes to disguise itself and it will allow malicious users to remotely access your computer and steal personal information. These backdoors are commonly indicated by high CPU usage spoolsv.exe and explorer.exe errors.
To fix this problem you will need to do a scan of your system to find the malware causing the problem, download Spyware Cease and do a scan of your system for malware and remove any threats it detects.
If the scan comes back clean you should run a registry cleaner and scan your system for explorer.exe related errors.
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