system
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Secondly, more than likely, you are running out of system resources and that is why the defrag stops.
Try shutting down all programs with Ctl/Alt/ and Del. except Systray and Explorer. Then try Defrag again. This should do the trick.
Sorry, what is systray.
The thing is, the defrag doesn’t stop…it doesn’t start!!
Thirdly, let’s try a manual update of Avast…all OK!