DEP (Windows protection)

The DEP (Data Execution Prevention - DEP data) functionality is installed in Windows XP (SP2), Windows 2003 SP1, VISTA, 2008 server and Seven which protects the installation of malicious code in the Computer Ram memory areas reserved for non-executable code. This technology is based on software technology (implanted in Windows) and hardware technology implemented in current processors such as Athlon 64, Opteron and Phenom (called NX - No Execute in AMD processor), Intel LGA775 socket (called XD or Active Bits) ... In hardware, processors compatible prevent execution of program code in memory areas marked as reserved for data. XP SP2 also reduces operations management mechanisms exceptions Windows.

If the DEP hardware is compatible with your processor, except the window above the poster as marked in red.

The DEP does not check the installation of software (including virus, spyware, trojan, adware...), It only monitors the software installed on the computer and verify the use of system memory by them. When using a prohibited zone, Windows automatically closes the program tries to access it. There is no checking of program type, all software is automatically stopped.

Programs entirely correct can be stopped, making their implementation impossible. This feature sometimes causes the boot the following message: "To help protect your computer, Windows has closed the following program".

If this type of error, first check your computer with a Anti-Virus and an updated anti-spyware (Ad-aware, Spybot, ...). If the software is actually a standard program and the absence of risk, you have two ways to permanently remove this error message: authorize an exception to this software or turn off DEP (not recommended).

1. Allowing an exception

If the program accesses memory is correct, you can delete that message by allowing the program to use this restricted area in RAM.

In the Control Panel, select "System". Under the Advanced tab, click on the Settings button in Performance.

Select the third tab (DEP data).

By default, the checkbox "Turn on DEP data for porgramme and Windows services only" is enabled. Select "Turn on DEP data for all programs and services except those I select."

The list of prohibited programs by DEP appears in the box below. You still check the box next to the program.

You can also add other programs using the "Add" button.

This activation requires the redémarage computer.

2. Disable DEP

Also in the System control panel, select the Advanced tab again. Click settings but under Startup and Recovery. The following window appears.

Click the edit button. It will allow you to access the Windows boot.ini file (hidden file) via NotePad. In terms of story / noexecute = .... (eg / noexecute = optin / fastdetect), substitute / noexecute = AlwaysOff.

Save your file and restart leaving your computer.

3. DEP Resume

For reactivate Use the same procedure as for the reactivation and replace / noexecute = AlwaysOff by / noexecute = Option.

Last update, le 2012/15/03