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Note: Because 64-bit kernels are Address Windowing Extensions (AWE) aware, there is not a separate PAE kernel in 64-bit versions of Windows.įor more information about PAE and AWE in Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:Ģ83037 ( ) Large memory support is available in Windows Server 2003 and in Windows 2000 Users do not have to separately enable PAE by using the /PAE boot switch. However, Windows will automatically enable PAE mode to support DEP. To use these processor features, the processor must be running in Physical Address Extension (PAE) mode.

The Execute Disable Bit (XD) feature as defined by Intel.

The no-execute page-protection (NX) processor feature as defined by AMD.

However, processors that support hardware-enforced DEP can raise an exception when code is executed from a page that is marked with the appropriate attribute set.Īdvanced Micro Devices (AMD) and Intel have defined and shipped Windows-compatible architectures that are compatible with DEP.īeginning with Windows XP SP2, the 32-bit version of Windows uses one of the following: Processor architecture determines how DEP is implemented in hardware and how DEP marks the virtual memory page. DEP functions on a per-virtual memory page basis, and DEP typically changes a bit in the page table entry (PTE) to mark the memory page. Hardware-enforced DEP relies on processor hardware to mark memory with an attribute that indicates that code should not be executed from that memory.

DEP helps prevent these attacks by intercepting them and raising an exception. A class of attacks exists that tries to insert and run code from non-executable memory locations. Hardware-enforced DEP marks all memory locations in a process as non-executable unless the location explicitly contains executable code. One kind of malicious code attacks tries to insert and run code from non-executable memory locations.

What is the DEP ?!!! Data Execution Prevention (DEP) is a set of hardware and software technologies that perform additional checks on memory to help protect against malicious code exploits. In some cases, the server needs to be physically shutdown in order for the new BIOS settings to take effect. Resolution: Enable Hardware virtualization or DEP in the BIOS. The virtual machine could not be started because the hypervisor is not running.Ĭause: Hardware virtualization or DEP was disabled in the BIOS. After the Hyper-V role is installed, When you try to create a new virtual machine, it fails to start with the following error: