You mentioned conhost.exe and that arrived in Windows 7 so let's read the next link.
OK, if I was to guess anything I would say this is more likely if the owner was playing around with themes or theming apps.
Try this. Create a new account and see if that happens there.
And a small point. I've yet to see a computer minimize. Maybe the window or application do that but not the entire computer. Unless you have some Transformers PC?
Please I am getting desperate my computer keeps minimizing every 1 minute and i cant play with it constantly minimizing, it literally minimizes everything I have found this dll.host and search indexer that appear normally in the performance monitor when it minimizes, sometimes conhost.exe please i already scanned with anti malware already in safe mode found no malware dont know what it is please