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And how can i view wich process is calling it? there are some Process ID not listed on the task manager /event viewer
As for 'Normal Usage' is 0%
Its just active in the background, but not doing anything till a call is made that uses it.
Normal users don't use WMI. Most Administrative users also don't use it. Its rarely used even in the tech department. (people have better alternatives if they need info WMI can get for them) WMI is basically handy for very big enterprise level corporations that have Windows systems everywhere, but then again its also kinda abusable.
Some windows internal programs use WMI.
Sometimes you might want to use WMI to get information yourself, but again; rarely.
wmic for example, you can use to check the status of your SSD or HDD.
And that also basically summarizes what it is used for mostly (if at all). Reading information and sending it to another program or to the user in front of the monitor.
Edit:
That last part should also explain how the WMI Host Provider process is now using a lot of processor power.
likely, a program requests information, constantly
and it doesn't seem to get the information for some reason (and thus stop requesting it).
hense the program is constantly reading and sending this information.