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High CPU use by taskhost.exe when Windows 8.1 user name contains "user" Email Print Symptoms The taskhost.exe process intermittently consumes high CPU on Windows 8.1 computers when a user account in the local accounts database contains the word "user Cause This is a problem in the component DFPCommon.dll in Windows 8.1. Resolution To resolve the issue. do not create a user account containing the string "user" on the computer.