The application (Essentails) was unable to start correctly (0xc00000ba)

Tried to download a iMovie but couldn't run because my computer reported a virus within the download, so aborted. So looked in the icon bar (bottom right) Microsoft Essentials was not running. Tried to run Essentials but the application error said 'The application (Essentials) was unable to start correctly (0xc00000ba). Click OK to close the application.'

Please help.


I suspect that the PC is infected by ZeroAccess/Sirefef:

Download Hitman Pro Kickstart on an uninfected computer, copy it to a USB flash drive and use it to repair MSE and remove the root kit virus, ZeroAccess/Sirefef.

Instructions and download here:



Try TDSS Killer: TDSS Killer may be run from a flash drive.


You may wish to download (on an uninfected PC) one or more of the following rescue scanners to create bootable media to scan the infected PC (list courtesy of forum member, GreginMich):

Each rescue scanner will miss things – because none of them will have a perfectly complete and up-to-date set of definitions; so you might need to use several of these rescue scanners, or something like the Shardana Antivirus Rescue Disk Utility, which creates a custom bootable CD or flash drive that includes multiple rescue scanners:

Another boot CD (similar to Shardana) to consider is Hiren's Boot CD.

You can also  start here - and select the link that says - I think my computer is infected. Options will vary by region, but phone support leads you to Microsoft Answer Desk ( in the US at this time. After an initial free consultation, a fee will be charged for assistance, based on the details of the case.

This web site - contains details for many of the common infections, often immediately after they began to appear in the wild, and instructions are provided for how to remove the infections using their malware removal guides. They also have forums where you can seek help from people who specialize in malware removal.

This may also be helpful - How to get rid of malware:



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Question Info

Last updated May 29, 2021 Views 6,504 Applies to: