MSE malfunction or malware/virus takeover

getting a failed-virus scan failed message whenever I try to download, cannot open MSE telling me to contact my system admin; I am the admin, cannot update MSE getting  error 80070643 could not start Microsoft antimalware service getting an error 5 access denied. Cannot even uninstall MSE to reinstall it. it seems like I need a way to scan the computer for viruses or malware without having to down load anything. can anybody help me??

Question Info

Last updated May 16, 2018 Views 117 Applies to:

The PC is infected by ZeroAccess/Sirefef


You need to 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:


You can also  -


Try Hitman Pro Trial Version: This program may be run from a flash drive.


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:


Windows Insider MVP (Security), Moderator Microsoft Community

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