Attached Link: complete article re vista security

dunno if this would help?

*Data Execution Prevention Off
Data Execution Prevention (DEP) is a security feature introduced in Windows XP, Windows Server 2003 and now in Windows Vista that looks for malicious code. If DEP’s analysis makes it think that executing code will cause unwanted activity, DEP intervenes and shuts the process down.

Sounds good in theory, but often DEP shuts down legitimate programs. Equally often, DEP fails to show any warning telling you it shut a process, leaving you wondering.

You might want to turn off DEP globally by issuing the following at an elevated command prompt (i.e., a shell running with administrative credentials): bcdedit.exe /set {current} nx AlwaysOff