CPU usage goes up to 100%

Hi, i'm having one problem for 7 months. CPU usage is going up to 100% with no reason on start.
In TaskManager, sometimes i could see svchost taking 600.000k of
memory. Once i stopped two programs in TaskManager(conhost, SearchProtocol) and my laptop gone half-normal, but they anyway start again.

Do someone know what should i do? Maybe i have virus, maybe its just system or my laptop is too old?

Any type of help will be appreciated.

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