HP 11A G6 EE with amd a4 9120c cpu converted to windows but speed is stuck @ 0.79ghz

I have an HP 11a G6 ee chromebook converted to windows but after i install windows, i noticed that the unit is very slow, I checked the performance in task manager, the cpu speed is stuck @ 0.79 ghz even i load more apps. please help me how to fix.

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Don’t run any other OS on this machine, anything other than chrome os is pain