Computer problems related to hard drive access are caused by Trojan.Autorun. Modified Autorun.inf file is dropped on users machine which messes up the system.
For more information see how to remove xn1i9x.com, amvo.exe, avpo.exe, kavo.exe related issues
Actually trojan shows fake security alerts and prompts user to click on the warning to download spyware removal tool in order to remove found threats, while in fact it is corrupt anti-spyware software.
Further information and Iedefender removal tutorial:
iedefender removal
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