Data Execution Prevention prevents itunes from opening on my user ID, but not every other user ID.

I completely deleted every Apple file from my computer. There are 4 user IDs on my computer. Mine is the Administrator, my husband's ID my son's ID. and a completely new ID I set up to see if I could get iTunes to work.
I reinstalled iTunes 10.5 on my Administrator ID. The installation went fine, but iTunes will not open in my ID, or my husband's ID. I get the message that Data Execution Prevention has closed it. iTunes will open in my son's ID, as well as the new ID I set up for iTunes testing.
I have tried uninstalling (deleting ALL Apples files) and reinstalling on my ID as a Standard user. Same thing. iTunes doesn't work on my ID or husband's, but does on the other 2 User IDs.
I have not activated Microsoft Outlook on the 2 IDs where iTunes works. Outlook is activated on the other 2 User IDs.
Does something about Outlook cause me to get the DEP error? Is there a way to fox this problem? I really don't want to have to go to a completely different User ID everyt ime I want to use iTunes.
I am using Windows Vista Home Deluxe, and installing the 64-bit iTunes download on the Apple.com website.
I have used instructions from several documents here on the Apple boards. The ones I use most are "iTunes for Windows:Doesn't open after upgrading in Windows Vista of Windows 7". "iTunes for Windows of Windows 7:Troubleshooting unexpected quits, freezes, or launch issues", and on this one, I followed the instructions for user-specific troubleshooting. I also followed the instructions in "General installation troubleshooting".
I have uninstalled and reinstalled iTunes so many times, i can almost do it in my sleep. Somebody please help. My iPhone and iPod need updating!! Thanks!!!

OS X 10.7 Lion, 10.8 Mountain Lion, 10.9 Mavericks and 10.10 Yosemite
Reset Password
Start the computer,then press and hold down command and R keys to start into recovery partition.
When you see the Apple logo, release the keys.
Wait until OS X Utilities window shows up.
Move the mouse to the menubar at the top and click "Utilities", then select "Terminal"
from the drop down.
Terminal window will appear.
Type in resetpassword and press enter on the keyboard.
Leave the Terminal window open.
Reset Password Utility window will open with Macintosh HD selected.
Select the user account from the popup menu box under “Select user account”.
Enter a new password.
Reenter the new password for the user.
Enter a hint.
Click the "Save" button.
Click  in the menubar and select Restart.
Log in.
If Keychain dialog box appears, select “Create New Keychain”.

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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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