What is DEP(Data Execution Prevention) ? How to configure DEP settings?

What is Data Execution Prevention

Data Execution Prevention (DEP) helps prevent damage from viruses and other security threats
that attack by running (executing) malicious code from memory locations that only Windows and
other programs should use. This type of threat causes damage by taking over one or more memory
locations in use by a program. Then it spreads and harms other programs, files, and even your e-mail contacts.

To configure DEP settings for Windows Server 2003 & ....

Need to modify Boot.ini file to prevent from this type of issues.

Physical Path of Boot.ini
1. Go to C: Drive
2. Click on Tools >> Folder Options >> view >> Uncheck "Hide protected operationg system files (Recommended)" >> Click OK
3. Now you can see the Boot.ini file

Change from /noexecute=####### to /noexecute=AlwaysOn and restart the computer.

To configure DEP settings for Windows and later & ....

1. Click Start, click Control Panel, and then double-click System.

2. Click the Advanced tab. Then, under Performance, click Settings.

3. Click the Data Execution Prevention tab.

4. Click Turn on DEP for essential Windows programs and services only to select the OptIn policy.

5. Click Turn on DEP for all programs and services except those I select to select the OptOut policy.

6. If you selected the OptOut policy, click Add and add the applications that you do not want to use DEP with.

Ref:
http://support.microsoft.com/kb/875352#5
http://channel9.msdn.com/forums/TechOff/227400-What-is-Data-Execution-Prevention-and-why-does-it-shut-down-IIS/
http://technet.microsoft.com/en-us/library/cc738483%28WS.10%29.aspx


Actual error is
Unexpectedly my website giving "Service Unavailable" message

"To help protect your computer, Windows has closed this program.
Name: IIS Worker Process
Publisher: Microsoft Corporation
[Change Settings] [Close Message]"

To avoid this error please read above information

Note: Please configure DEP settings at your server.