Problems with Intelppm.sys and processr.sys under Virtual PC / Virtual Server

  • Comments 46

Under certain circumstances with a Windows XP / 2003 operating system - intelppm.sys and processr.sys can cause a virtual machine running under Virtual PC / Virtual Server to crash (by default this will cause the Windows guest operating system to reboot automatically - but if you have changed this setting you will see a blue screen).  The reason for this crash is because these drivers are attempting to perform an unsupported operation inside of the virtual machine (like upgrading the physical processors microcode, changing power state on the physical processor).

Today this problem only occurs on Centrino and AMD K8 processors.  Most people see this problem when they move a virtual machine that was created on another type of processor to a computer running one of these types of processors (and then they usually see the problem when they attempt to shutdown their virtual machine for the first time).  Now you may be wondering why you have not heard about this problem more often - and the reason for that is that if these drivers fail once - they are smart enough to not attempt to perform the operation that failed again.

If you are seeing this problem repeatedly you can manually disable these drivers (with no negative side effect) by going to the following location in the registry:




And changing the 'Start' value to '4'.

In the mean time we have made some subtle changes to the way our hardware exposes the processor in Virtual Server R2 so that in future products these drivers should never get loaded inside of virtual machines.


Leave a Comment
  • Please add 6 and 6 and type the answer here:
  • Post
  • this might help mysterious reboots that I get (daily it seems) from my 2003server guest (XP host).

    so do we change the host or guest registery?
  • Sorry for not being clear there - you make the change in the guest registry.

  • So that's why VirtualPC doesn't work right on my (Centrino) laptop!

    Also, rather than wondering around in the registry, you're better off using "SC" command (included with Windows XP/2003), like this:
    sc config processor start= disabled
    sc config intelppm start= disabled
    This is in the guest OS, of course.
  • Thanx, Ben & Jonathan. We just slammed into this issue with one of our [Avanade's] clients, but it's going the other way from what you described. A W2k3 image created and sysprep-ed on a Centrino notebook tanked when run on a desktop P4 w/ HT... The processor service couldn't be found on the image, but the "sc config intelppm start= disabled" cured it AFTER I copied the image to the P4 BEFORE running sysprep. Thank you!! Note that it didn't work when I disabled intelppm and sysprep-ed on the Centrino and then tried to run it on the PCs...
  • Ben,

    FYI, I have the problem consistently on my DELL XPS Gen 4 (Intel P4 3.6 GHz, hyperthreading on) running Windows XP Media Center 2005.


  • Note: I had to use the SC commands at a Safe Mode with Command Prompt because my VPC Instance couldn't even login without blue screening. After applying the two changes in Safe mode everything works fine.
  • This article was realy useful to me. To prevent to spend so much time to reintalling again all stuffs...


  • Thank you too much, Thats works really good

    Francisco, from Argentina

  • That's for the heads up on this.

    Just as a note though. I had to start the guest machine in safe mode so the registry entry I had to change wasn't "...\CurrentControlSet\..." but was "...\ControlSet002\..."

  • Thank you, thank you, thank you! Even here in 2010 this has brought my Sun VirtualBox back to life!

  • Champion!

    Solved my problems.

    Moving a Guest XP 32bit from a 64bit Mandriva system to:

    a 32bit Linux Mint host.

    All on VirtualBox.

    Thank you!

  • You are a wonderful person.  I had this problem with a Centrino processor using Virtual Box and it was driving me crazy.  Simply changed the registry as suggested for the intelppm and the problem went away.  Thanks again

  • Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you,Thank you!!!!!!

  • Thanks a million, Ben. You have just solved my problem.

  • Thanks a lot! You have saved my day!

Page 1 of 4 (46 items) 1234

Problems with Intelppm.sys and processr.sys under Virtual PC / Virtual Server