I'm running Windows XP Home Edition. XP has a feature called 'Data Execution Prevention' or DEP. I didn't know XP had such a feature until I downloaded and tried to run one of the DCS Freeware programs, cmdline.exe. DEP stopped cmdline.exe from running. OK, so I crossed my fingers and turned DEP off for cmdline.exe Yesterday, I tried to run another DCS Freeware program, asviewer.exe. Same thing. DEP stopped it from running. This time I didn't turn DEP off because now I'm starting to get worried. Can anybody please tell me why DEP is stopping DCS programs from running? I've downloaded and used a LOT of freeware and I've never had DEP stop anything from running until now.