But it’s also a useful tool for other purposes as well. So how to know what’s what?
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In this case, without seeing the entries, it’s hard to say.
The good news, unless you actually did something to your hosts file yourself, chances are the only entries there are the result of spyware.
- make a backup copy of the hosts file
- delete all those entries out of the hosts file
- see if you can get to an anti-spyware and an anti-virus tool, and run both immediately.