My computer has been hijacked

I am typing this on my smartphone since my computer has been hijacked... by my common-law wife... who is watching cake shows on Youtube and playing Facebook games (it has been like this for the last week).

Time to buy an extra computer! Any ideas on what to look at? It is a jungle out there. I will be running some Linux flavor and code like mad. No games though. We have gaming consoles for that.

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