First make sure you are installing known good software (not something questionable).
You can disable DEP for the software you are installing by going to System Properties > Advanced tab > Performance settings button > Data Execution Prevention tab > tick the button for Turn on DEP for all programs and services except for those I select. Then Add the program you are having trouble with.
You can also completely disable DEP for all programs by editing the boot.ini file (C:\boot.ini) by changing /NOEXECUTE=OPTIN to /NOEXECUTE=ALWAYSOFF. You must reboot for the change to take effect.
I used System Properties > Advanced tab > Performance settings button > Data Execution Prevention tab. I chose Turn on DEP for all programs and services except for those I select, and then I chose all the programs. Does that work?
Did it correct your problem? If not you can disable DEP from running at all using the second method I posted. I would expect it to only cause trouble with just a few programs though. If DEP causes trouble with all programs, then I think you have some other problem.
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