Why doesn't DVD Shrink work under Windows 7?

Windows XP onwards was given a new facility Data Execution Prevention (DEP).

The following is from Microsoft help:

Data Execution Prevention (DEP) is a security feature that can help prevent damage to your computer from viruses and other security threats.

Computer programs set aside a portion of your computer's memory for data, and another portion for instructions that your programs use. Hackers can try to trick programs into running (also known as executing) harmful data placed in your computer's memory as if it were instructions. This could allow a hacker to take control of your computer.

DEP can help protect your computer by monitoring your programs to make sure that they use computer memory safely. If DEP notices a program trying to run instructions from the portion of memory used for data, DEP closes the program and notifies you.

If you want to turn off DEP for a program you trust, first check to see if the software publisher has made a DEP-compatible version of the program or made an update available before you change any DEP settings. If an update or DEP-compatible version is available, we recommend installing it and leaving DEP turned on so you can benefit from the protection it can provide. But if the publisher has not released an updated, DEP-compatible version of the program, you can turn off DEP for the program. You'll be able to use the program, but it might be vulnerable to an attack that could spread to your other programs and files.

1. Open the System
2. Click Advanced system settings.  If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
3. Under Performance, click Settings.
4. Click the Data Execution Prevention tab, and then click Turn on DEP for all programs and services except those I select.
5. To turn off DEP for an individual program, select the check box next to the program that you want to turn off DEP for, and then click OK.
   If the program is not in the list, click Add. Browse to the Program Files folder, find the executable file for the program (it will have an .exe file name extension), and then click Open.
6. Click OK, click OK in the System Properties dialog box if it appears, and then click OK again. You might need to restart your computer for the changes to take effect.

Note

• To turn on DEP for a program, clear the check box next to the program that you want to turn on DEP for, and then click OK.