ITunes Windows Vista - Error 7 - Windows error 998, DEP

Question

Trying to install iTunes on windows vista laptop, iTunes installs but when i try to open it i recieve:
Error 7
Windows error 998
Data Execution Prevention
Have tried all solution given on apple solution website. Desperate for some help if any has some.
Thanks

Answer 1

(Apologies for barging in, wha.)
In this context (launching itunes), DEP errors can indicate that some other program (other than QuickTime itself) has sprayed old versions of QuickTime componentry into unorthodox locations on the PC.
Although the error 7 is most commonly associated with Apple Application Support or .NET framework problems, it can also be associated with QuickTime trouble ... so that's consistent with the old, misplaced QuickTime componentry troubles as well.
So I think we'd better check on that possibility.
You'll need to check some view settings on the PC first.
1. From the Start menu, click Open.
2. In the Organize menu, click Folder and Search Options.
3. Click the View tab.
4. In the "Advanced settings" pane under "Hidden files and folders" make sure that the "Show hidden files and folders" option is selected, and the "Hide extensions for known file types" option is unchecked.
5. Click OK.
Now go "Start > Computer".
In Computer, open "Local Disk C:" or whichever drive your operating system is installed on.
Open the "Windows" folder.
*If you have a 32-bit Vista,* open the "System32" folder.
*If you have a 64-bit Vista,* open the "SysWOW64" folder.
What files or folders can you see in there with QuickTime in the file or folder name? (In a standard installation of QuickTime, you should see precisely two files ... QuickTime.qts and QuickTimeVR.qtx ... and no QuickTime folders whatsoever.)