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Server 2012 Error

Server was working fine, after installing the Hyper V required a restart - And after the restart gives the attached error message before the login screen.

Would like to know how this can be fixed or can get repaired. Would NOT like to do a clean reinstall due to some data being already installed.

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Lee W, MVP
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The picture helps but is not entirely clear - WHAT .sys file is that?  It looks like a driver issue.
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Its "teefer.sys" - Everything was working fine, till the Hyper V got installed and after the reboot gave me this error. Tried in safe mode as well same issue.

Anyway in 2012 you can reinstall the files over without the files getting deleted?
Seems like its associated with Symantec End point which got installed before the HYPER V but never got restarted after the installation.
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teefer.sys is not found but i did rename teefer2.sys - But comes up with same message again
From that command prompt off the setup media:

DIR /S /B teefer.sys

Should tell you where on the system it is.  May take a while.
Installation media of server 2012
second screen shift f10
d:\windows\system32\drivers and then checked teefer.sys but did have teefer2.sys

seems like after restarts it just comes back up - i have even deleted it but teefer2.sys is still there after the reboot

D is the data drive which has the windows installed on the system
It just says file Not Found
i have searched for teefer2.sys files - found them, renamed the files - Server came back up.

Thanks alot for all your help in this.

Appreciated