/products/building/performance/b/building_performance_blog/posts/windows-uac-and-bentley-hevacompUAC - why is it there, what does it do and why has it broken my installation? With the introduction of (the much maligned) Windows Vista in 2007, Microsoft tm introduced a new security feature - UAC. UAC (or User Account Control) was an attempt toen-USTelligent Community 12