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Recently I've noticed my hosts file resetting itself.

 D:\Windows\System32\drivers\etc  (OS installed on D drive)

First time it reset it to the default, and now for the first time its completely disappeared after installing a whole bunch of updates.

I don't have any virus protection other than Microsoft's Security Essentials.

What's going on???

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i would assume a virus would ADD entries rather than delete them anyway! unless its virus protection removing the changes - in which case i'd only expect it to remove entries for rogue entries for popular sites such as facebook.com – Simon Apr 29 '10 at 6:40
    
if anyone else upvotes this question - could you please comment if that means you have the same problem. i'm wondering if its due to a recent update or something else – Simon Apr 29 '10 at 6:40
    
+1 I have the same problem. I would like to know if there is a way to mark the current version as correct (I have intentionally added "rogue" entries for facebook.com to block the "Like" button and I want these to be preserved.) – finnw Nov 27 '11 at 13:46
up vote 2 down vote accepted

A quick Google shows that MSE does in fact play around with your hosts file:link

Maybe try disabling/uninstalling it and see if it persists.

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