What is Vax347b?

Vax347b.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 Vax347b.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for Vax347b drivers in need of updating

Vax347b.sys file information

Here is some of what is known about the Plug and Play BIOS Extension process. Up to now, our technical analysts have not been able to relate it to any particular software.

Description: Vax347b.sys is not essential for Windows and will often cause problems. Vax347b.sys is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/8/7/XP is 159,616 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. There is no information about the author of the file. The program is not visible. There is no detailed description of this service. The file is not a Windows system file. Vax347b.sys appears to be a compressed file. Therefore the technical security rating is 49% dangerous, however you should also read the user reviews.

Recommended: Identify Vax347b.sys related errors

Important: Some malware disguises itself as Vax347b.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the Vax347b.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

Belongs to Alcohol 120
  Douglas Cumali   (further information)
Part of Alcohol 120
  Douglas Cumali   (further information)
Seems to be a driver for Alcohol 120%
Well I have no clue what it is, however my computer will not boot up. When I try to boot it up in safe mode the file it freezes on is Vax347b.sys. If I cansle the loading of this file I can get into safe mode.
  Ryan Storment  
I think it is a file by Alcahol 120%, not needed.
installs with alcohol 120 , changes sys files, but doesnt seem to be dangerous...
  brad   (further information)
I uninstalled Alcohol 120%, no more BSOD
This is a file used by Alcohol 120%, to emulate the virtual CD-ROM drive. It allows you to change the number of virtual drives without restarting.
  Alan Childs   (further information)
It's a essential windows system file during startup
Driver for Alcohol 120$
Vax347b.sys belongs to Alcohol 120%. A program that lets you create virtual dvd devices
  Mattias HammargĂ„rd  
its the device driver for the Alkohol120% virtual DVD-Drive
  freidenker   (further information)
its preventing me from booting my computer into XP
It wouldn't load during windows startup, and caused normal starutup impossible because of this.
Rootkit detected by Vice
  ComteZer0   (further information)
It doesn't work with windows Wista ( it will hang the SO)
cant load windows xp with it
Would not let me boot up windows XP in any mode, including safe mode. I also installed Alcohol 120. Have now re installed and destroyed my alcohol disk to save me the temptation to install it again.
showed up after alcohol 120 install. only 1 error in event mgr., seems ok. alchohol works and my machine seems to boot fine.

Rating chart

Summary: Average user rating of Vax347b.sys: based on 22 votes with 19 user comments. 8 users think Vax347b.sys is essential for Windows or an installed application. 2 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 6 users suspect danger. 2 users think Vax347b.sys is dangerous and recommend removing it. 3 users don't grade Vax347b.sys ("not sure about it").

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Best practices for resolving Vax347b issues

A clean and tidy computer is the key requirement for avoiding problems with Vax347b. 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 Vax347b.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

Vax347b.sys [all]