What is a347bus?

The genuine a347bus.sys file is a software component of Plug and Play BIOS Extension by Microsoft.
The Plug and Play BIOS Extension is a driver file that is an extension for BIOS. It enables Plug and Play processes to communicate with the BIOS before the operating system loads. While not necessary for Windows 7 and higher, the Plug and Play BIOS Extension was still necessary on Windows XP workstations in some instances.

A347bus.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if a347bus.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for a347bus drivers in need of updating

A347bus.sys file information

The Plug and Play BIOS Extension process does not provide any identification of the producer.

Description: A347bus.sys is not essential for Windows and will often cause problems. A347bus.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 160,640 bytes (87% of all occurrences) or 158,720 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no file description. The program is not visible. There is no detailed description of this service. It is not a Windows system file. a347bus.sys appears to be a compressed file. Therefore the technical security rating is 48% dangerous, however you should also read the user reviews.

Recommended: Identify a347bus.sys related errors

Important: Some malware disguises itself as a347bus.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the a347bus.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Alcohol 120% v347 virtual driver
  Mat128   (further information)
Alcohol 120%
this file can seriously muck up your windows install - starts blue screening windows when it tries to load it at the start - steer well clear!
Virtual Device Driver for CD Drive Emulation
Alcohol 120% v347 virtual driver but it can screw up your windows start because, Alcohol 120% have some problems with WINXP see also:
  jopps   (further information)
it is the default name for the Alchol 120% virtual drive device driver it does however have problems that can cause a system to hang
I have a problem with this file, and reading another experiences, I remove Alchool software and the problem was solved. I think there is an incompatibility from Alchool with XP.
My PC is blue screening immediatly following an XP upgrade. a347bus.sys is where the system hangs when attempting to go into safe mode.
Can be hijacked by trojan and will crash machine when installing spybot search and destroy
This is a file belonging to the burn program Alcohol 120%
  Hans Solo   (further information)
THis is a device driver from alcohol 120% to provide virtual cdroms to your system. Do not forget to remove all virtual drives before you make an update to a newer version of alcohol soft 120% - You can remove the driver manually; First uninstall the CDROM in your Device Manager (WinXP) and uninstall the SCSI driver with include the number 347...; Then remove the files "a347bus.sys" and "a347scsi.sys" from your WINDOWS System21 drivers and restart; If you get an error under "System devices - Plug&Play BIOS Extension" uninstall this too; Well, at this moment the virtual drive is removed!
If the safe mode boot hangs after you see a347bus.sys then it is the next driver in line NOT a347bus.sys that is failing.
after reinstalling windows,the pc hangs on a347bus.sys and restarts - nomatter what. need to do a reformat to get rid of it
After debuging my system I found that a347bus.sys patches the kernel service table.
The problem here is that a347bus puts heavy hooks in your system. The same kind of hooking that Trojans do.
Its Alcohol - After uninstalling it the system booted fine
if wat previous opnes said about it is true... then if ur missing it, it will really mess u up, my pc won't start in safe mode either, i get this error message that the said file isn't there, so i am guessing its the reason why my pc won't start
Puts up some kernel hooks. Alcohol 120% uses this to hide its registry entries from blacklisting of applications or games. Is removed totally when A120% uninstalled.
Certainly, it's a driver for virtual cd-rom units made by Alcohol 120%. A good way to locate the problem is to boot WInXP in safe mode. Then the system asks to press Esc to not load the a347bus.sys driver. Then you know what is the problem. In my case, WinXP were unable to boot whith this driver for loading. The proccess described doesn´t fail!! It´s no dangerous if it´s made by Alcohol 120%, in this case is only a compatibility problem (see other problems within Alcohol 120% and WinXP described here), if it appears without a installation of Alcohol present, you have a serious problem...
Virtual SCSI driver. Not possible to bbot into safe mode!
System was locked during startup process. Also starting up in safemode it locked up. Just before locking up it said hit escape to load a347bus.sys. Hitting it would brought me in a working safe mode. After renaming it my system act normal again.
This driver can seriously screw your computer, I recommend you avoid this programme as much as possible. Since the software distributor doesnt seem to provide support for this problem, i'd avoid any other programmes by them aswell.
  CaNNoN_FoDDa   (further information)
Alcohol 120% uses this driver for emulation settings and for the virtual cd drives; my system crashed after i had tried to do a repair (copy back all system files from install cd) - suddenly the device driver a347scsi.sys (which is loaded right after a347bus.sys) caused several bluescreens. i had to manually disable these two drivers from the boot list.
when installing alcohol 120% and you click professional mode you will get the virtual CDROM drive installed and the a347bus.sys driver will appear. If you do not click the box for professional mode yopu will get alcohol 120% without the virtual drive. Its up to you.
  Gaggers Mac  
It's from Alcohol 120% virtual device driver cd rom.
just plug the hard drive into another computer, and view contents and remove the file.
  It works  
required/installed by Alcohol 120%
  najevi   (further information)
In windows vista it generates some Blue Screen on startup. Im going to use an Ubuntu Live CD to eliminate this.
BSOD´d my PC. Uninstalled Alcohol 120.
a347bus.sys was a bios extension file.previously I used a system with p4 processor with 915gvwb motherboard(2005-2015)with same windows xp professional os sp2 and i won't faced any single problem with alcohol 2016 that p4 processor gone and I upgraded to g31 mb(core2 duo) with 2014 bios.I loaded this same xp prof sp2 to that sys and installed alcohol.nw it reboots and blew os files automatically especially bios finding.I think its because of bios update.

Rating chart

Summary: Average user rating of a347bus.sys: based on 30 votes with 30 user comments. 10 users think a347bus.sys is essential for Windows or an installed application. 2 users think it's probably harmless. 6 users think it's neither essential nor dangerous. 10 users suspect danger. 2 users think a347bus.sys is dangerous and recommend removing it. 7 users don't grade a347bus.sys ("not sure about it").

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Best practices for resolving a347bus issues

A clean and tidy computer is the key requirement for avoiding problems with a347bus. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the a347bus.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

a347bus.sys [all]