One popular "solution" is to just disable DEP, but I would rather figure out what it is and fix it.
Here are some ideas to narrow it down.
Since I now understand that it is Windows Explorer
, I suspect a non Microsoft Explorer Shell Extension. Shell Extensions help make up the Right Click menu for files you see in Explorer.
You can download ShellExView from here to see which ones you have loaded:http://www.nirsoft.net/utils/shexview.html
ShellExView doesn't install anything on your computer, it just runs and displays.
When you launch it, the non MS extensions will be in light pink, but on some systems that is a hard color to see, so click View, Choose Columns and move the Microsoft column closer to the top so you can see it on your screen without having to scroll left and right.
Sort the display by clicking the Microsoft column so all the "No"s are at the top and easy to see.
I am not a trial and error advocate, but I can't think of another way to do this...
Right click and disable the non Microsoft extensions one at a time keeping a list so you can enable them again later if desired. Test your failure condition.
If you recognize any that you may have downloaded lately, start with those. The Extensions are not uninstalled, just disabled.
The hope is that you will find the one Extension that causes the DEP error and then you can figure out what to do about it.
I don't have your issue but I can see that the Extension is immediately disabled, so disabling one does not require a reboot but if you find the culprit, I would reboot anyway to really be sure.
There may also be an Event Log entry that will point directly to the problem.
To see the Event Viewer logs, click Start, Settings, Control Panel, Administrative Tools, Event Viewer.
A shortcut to Event Viewer is to click Start, Run and in the box enter:
Click OK to launch the Event Viewer.
The most interesting logs are usually the Application and System.
Each event is sorted by Date and Time, so create your error and look for an event at that time.
If you double click an event, it will open a Properties windows with more information. On the right are black up and down arrow buttons to scroll through the open events. The third button that looks like two pages on top of each other is used to copy the event details to your Windows clipboard.
When you find an interesting event that occurred around the time of your issue, click the third button under the up and down arrows to copy the details and then you can paste the details (right click, Paste or CTRL-V) the detail text back here for analysis.
Edited by joseibarra, 28 November 2009 - 08:42 AM.