Sometimes need to press ctrl + alt + del to return to normal, why?

Users questions:My house is installed windowsXP system, which after a while all of the software into the system sometimes can not function properly, but I press ctrl + alt + del to open Task Manager and then close it can run properly ... ... sister taught me ways ~ but do not know why ~ who know what this isPrinciples ah?
Experts answer: press ctrl + alt + del to open Task Manager can be run to force an error or interrupt the process of failure or software failure process is occupied by the release of a large number of system resources.
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