Hi, I've copied and pasted this from 'help and support'....
Change Data Execution Prevention settings
Data Execution Prevention (DEP) is a security feature that helps prevent damage from viruses and other security threats by monitoring your programs to make sure they use system memory safely.
If you choose to protect all programs, you can still turn off DEP for individual programs. If you suspect that a program does not run correctly when DEP is turned on, check for a DEP-compatible version of the program or an update from the software publisher before you change any DEP setting.
If you open 'System' (via the control panel) and then advanced system settings, click on performance. You'll then see DEP across the top and can configure it from the resulting page..