Windows Dev Center

Windows Phone 8 Emulator Couldn't change memory of the virtual machine: Error code 32775 [solved]


  • Hi all.

    I would like to share the solution to this error scenario:

    I’ve upgraded my Win7 Pro 64 bit to Win8 Pro 64bit and then installed WinPhone8 SDK.

    VS 2012 and TrendMicro antivirus were already present.

    When you run your WP8 app in debug mode on the WP 8 emulator, it does not start and displays this error message: “The Windows Phone Emulator wasn't able to set some properties on the virtual machine: Couldn't change memory of the virtual machine: Error code 32775

    The main issue seems to be already known to those who already worked with Hyper-V on a machine with TrendMicro antivirus installed. The same happens with other antivirus programs as well.

    Trend Micro description: “The root cause is that Hyper-V uses non-cached I/O requests while the real-time protection of antivirus software often uses mapped I/O requests.”

    You can find the suggested solution in these posts:

    Does OfficeScan 10 support Windows Server 2008 Hyper-V?

    Virtual machines are missing, or error 0x800704C8, 0x80070037, or 0x800703E3 occurs when you try to start or create a virtual machine

    Both articles contain instructions on which folders and processes should be excluded from the antivirus checks.

    Ever since the articles are not so recent, I had to add to the processes exclusion list also the following two:



    ...and everything is now working fine: the WP8 emulator correctly opens in all available configurations.

    Hope this will save you some time.


    Thursday, March 14, 2013 11:30 AM


  • Hi,

    Thank you very much for posting this solution to the forum!


    Mark Chamberlain Sr. Escalation Engineer | Microsoft Developer Support | Windows Phone 8

    Thursday, March 21, 2013 1:58 PM