This thread has been inspired by my reading of opinions of several posters. he question is what effect on security has changing from low integrity levels to medium or high integrity levels (on Vista and Windows 7, but not on Windows XP?)? And that some virtualization softwares like Sandboxie, Bufferzone have that issue? I really don't understand what is the difference between low level and medium level security. If SBIE can block start/run access of any malware as well as block any malware to access the Internet, than where is the problem? I guess, user's mistake or impracticability? Supposedly, Tzuk has handled this problem (that's what I heard, so that's "he said, she said" situation). And why none has ever faced the possibility if any hacker wants to destroy/disable DefenseWall's, SBIE's, Bufferzone's protection (you name it), than they will do it and there is nothing you can do about it? Is it true the only reason why DW, SBIE or Bufferzone have not been compromised is because they are not widely used by too many people (like Linux)? If they were, they would be vulnerable to attacks and malware like antiviruses are today? Is this true? Thanks to all. And what about internet attacks? Like man-in-the-middle, buffer overflows, DNS spoofing and tocttou attacks and etc...? Does an virtualization software (DefenseWall,Sandboxie, GesWall and etc...) protect against internet born attacks? I guess you really need good software or hardware firewall for all these internet attacks? Thanks to all.