We do not recommend changing the DEP settings (Data Execution Prevention) because your system constantly monitors the programs running on our system and protects it from viruses and other security threats. If a security threat is found, it closes that program if they pose a threat.
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 settings.
Listed below is a link to a forum discussion regarding similar issues with Vcast.