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Windows 7: Portcls.sys and Kernal mode Bsods

13 May 2013   #1

Windows 7 Home premium x64
Portcls.sys and Kernal mode Bsods

Recently I been having multiple Bsods on a daily basis they can occur whenever but most of the time they occur wehn using online applications.
Example of when portcls.sys Bsods occur:
On skype calls
When creating a party on Neverwinter beta
When trying to play Arma 3 alpha online
Speratically on Legue of legends

Kernal Bsods occur Multiple tmes a day without addtionla applications being launched, please see attached .dmp files.
Any help would be appreciated
Thanks, Zantier

My System SpecsSystem Spec

13 May 2013   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x86 Service Pack 1 - Linux Mint Mate 14 x64

BugCheck D6, {fffff98006551018, 0, fffff88004c73b15, 0}

*** WARNING: Unable to verify timestamp for vrtaucbl.sys
*** ERROR: Module load completed but symbols could not be loaded for vrtaucbl.sys

Could not read faulting driver name
Probably caused by : portcls.sys ( portcls!GetMaxMapRegisters+5 )
Usual causes:  Device driver
This is an interesting bugcheck, since I have never analyzed one with this particular stop code, although it appears that a driver has referenced address space outside of it's current pool allocation. It appears that a Windows Port class driver (driver for port devices) was reading the referenced memory address (if I'm right).

Anyhow, the guilty driver is most likely, the Virtual Audio Cable driver, I would suggest finding an update from their support page, which can be found here:If that doesn't make a difference, then please remove the associated program with Revo Uninstaller Pro - Uninstall Software, Remove Programs easily, Forced Uninstall, Leftovers Uninstaller

6: kd> lmvm vrtaucbl
start             end                 module name
fffff880`04c62000 fffff880`04c70a00   vrtaucbl T (no symbols)           
    Loaded symbol image file: vrtaucbl.sys
    Image path: \SystemRoot\system32\DRIVERS\vrtaucbl.sys
    Image name: vrtaucbl.sys
    Timestamp:        Mon Feb 15 17:07:10 2010 (4B797F3E)
    CheckSum:         0001BBDF
    ImageSize:        0000EA00
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
Remove (suggested):

Pando Media Booster	c:\program files (x86)\pando networks\media booster\pmb.exe
Read this thread for information:I also noticed you don't appear to have any active anti-virus protection:

Install and perform full scans with:
information   Information
Remember to install the free version of Malwarebytes not the free trail; untick the free trial box during installation. MSE is the most lightweight and compatible with the Windows 7 operating system

You can also view this thread for a complete free and lightweight security protection combination:
My System SpecsSystem Spec

 Portcls.sys and Kernal mode Bsods

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