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mkeyc

Data Execution Prevention - Run a DLL as an App errors

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System Specs:

Dell Latitude D630 laptop with Windows XP Pro SP2 installed.

I decided to install SP3 and after the install I cannot open firefox, IE, Adobe, etc.. I cannot access the System menu in control menu to make changes to DEP. Every application I try to start I basically get DEP. I tried to restore SP2 but I get the same message 'To help protect your computer, Windows has closed the program. Run a DLL as an App.'

I cannot run HijackThis as DEP closes the application.

Any suggestions on how to revert back to SP2 or fix the errors in SP3?

Thanks in advance!

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You should be able to remove SP3 thru Add/Remove Programs. From your description of things, I'd say you are probably already infected with some sort of virus or malware. Have you tried to run an antivirus scan recently? Try in Safe Mode with Networking.

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DEP is designed to slow down viruses and other malware, it keeps them from writing to protected memory. If your getting DEP msgs its a good idea to check your computer for malware and viruses. Since you can't seem to run anything while DEP is turned on there are a couple of ways I know of to turn it off completely, which should give you the ability to run the programs you need to see if you've got some type of infection.

The first way is to disable it in your BIOS (but older computers/processors don't support this method so you may need to do it the second way anyhow)

In BIOS there may be an option to disable DEP or the "NoExecute (NX) Bit" if your processor has DEP support built in. If you have an Intel Processors, it also disables the Physical Address Extension support on the processor so you'd need to add the /PAE switch to boot.ini if you have more than 3.5Gb of RAM in the system that you need to address. You have Windows XP so you proably don't have more than 3.5GB of RAM.

The second way to disable is to modify the boot.ini file in the root of your c:\ drive (or which ever dirve the OS is on). The file is hidden and marked read only, so you will have to go to folder options and select show hidden files and folders, as well as uncheck the Hide protected system files box. Then you can change the read only properties by right clicking on it and selecting properties, then open in notepad.

multi(0)disk(0)rdisk(0)partition(1* )\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect

Change the /noexecute=optin entry to be /noexecute=alwaysoff . This will completely disable the DEP subsystem in Windows (for both processors that support DEP and processors that don't). Be careful if you screw up this file you will have to edit it from another computer to get your computer to boot again.

Reset the boot.ini to readonly and reboot. DEP should now be disabled.

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Microsoft Security Essentials

http://www.microsoft.com/en-us/security_essentials/default.aspx

Malwarebytes - just get the free version

http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?tag=rb_content;main

USB adapter

http://www.geeks.com/details.asp?invtid=2020&cat=CBL

PCS, I just finished chatting with mkeyc. We determined that they will run virus scans on the hard drive through another pc.

The ini file isn't where it should have been and unhiding folders didn't seem to be working.

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It's there, I forgot to tellhim to uncheck Hide protected operating system files when he selects show hidden files and folders. My fault

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