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.. title: Workaround for DEP error in Windows
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.. slug: 2013/01/25/workaround-dep-error-windows
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.. date: 2013-01-25 15:01:22 UTC
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.. tags:
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.. description:
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|Windows|
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Recently we have had users `report issues with
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OpenLP <http://forums.openlp.org/discussion/1906/openlp-1-9-12-crashes-on-my-windows-vista-laptop/p1>`__
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running on certain installs of Windows with an error about DEP. This
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seems to be mostly on Windows Vista but could possibly be an issue with
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more recent versions of Windows. DEP stands for Data Execution
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Prevention. In short this is to prevent malicious programs from using
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memory in a way that it shouldn't. That is a really poor description,
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but the `folks at Wikipedia have a detailed
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description <http://en.wikipedia.org/wiki/Data_Execution_Prevention>`__.
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You can `find out more from Microsoft
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too <http://windows.microsoft.com/en-US/windows-vista/Data-Execution-Prevention-frequently-asked-questions>`__.
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When a program you know you can trust experiences an issue with DEP you
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should be able to `disable DEP for that
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program <http://windows.microsoft.com/en-US/windows-vista/Change-Data-Execution-Prevention-settings>`__.
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There is an issue, however, chances are if you try this method OpenLP
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will not be listed (manually selecting the exe will also not work from
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my experience). This will make it impossible to disable DEP for OpenLP
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and to use OpenLP. This leaves us at Plan B, disabling DEP system wide.
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From my reading this doesn't apear to put you at a terribly greater
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security risk if you have good safe computing practices. Using system
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restore (creating a restore point), backing up your system, contacting
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your systems administrator, and all other warnings are in play here
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since this will in theory weaken your computer's security.
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Now you are aware what this does, here is how to disable DEP and get
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OpenLP running.
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First, you need to open an elevated command prompt or administrative
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command prompt. If you are unsure how to do that, Vista x64 has a great
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`guide on how to do
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it <http://www.vistax64.com/tutorials/181765-elevated-command-prompt.html>`__.
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Next enter this command into the elevated command prompt:
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**bcdedit.exe /set {current} nx AlwaysOff**
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You should get a message back letting you know the changes have been
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made successfully.
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Close the command prompt and all running applications then reboot your
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machine.
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OpenLP should now start and run for you. If you want to enable DEP later
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open an elevated command prompt and enter:
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**bcdedit.exe /set {current} nx OptIn**
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Reboot and DEP is now enabled again.
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These instructions were taken from `instructions on the Vista x64
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site <http://www.vistax64.com/tutorials/120778-dep-enable-disable.html>`__
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I suggest you give it a look also.
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This may not be the best way to do this as we don't seem to have any
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real DEP/Windows experts here so if you have a better way let us know in
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the comments below and if it checks out we will update the blog entry.
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.. |Windows| image:: http://openlp.org/files/u1284/Windows-8-logo-300x300.jpg
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