To run Chaser Full v1.50 with Windows Vista/7 you have to disable DEP, to do that follow the these instructions:
1. Click Start
2. Click All Programs
3. Click Accessories
4. Right Click on Command Prompt
5. Left click on Run as Administrator
6. Click the Allow button if it asks you for permission
7. Type or copy and paste this into the command prompt window:

 bcdedit.exe /set {current} nx AlwaysOff

8. Hit enter and you should see the confirmation: Operation Completed Successfully
9. Reboot and DEP should be off.

*If  you recieve an error at step 8 click Start, Run and type:
  bcdedit.exe /set {current} nx AlwaysOff
  then press Enter and Reboot.

-More about DEP can be found here:

http://en.wikipedia.org/wiki/Data_Execution_Prevention

http://www.mydigitallife.info/2007/01/15/disable-and-turn-off-or-enable-or-turn-on-data-execution-prevention-dep-in-windows-vista/

-If you need any help please feel free to ask for it in our CBOX.