I wanted to break off the other thread because most of the issues I see concern windows 8 systems. I am running a completely updated 7X64 Pro and want to buy Sandboxie after reading through their site. Tzuk says that on windows 7x64 version 4.09 is a smooth as 3.76 almost certainly. I have read through the "protection mode" issue on 7 64 bit systems and version 4 sounds like its a better approach. I want to support Sandboxie and don't mind paying the very reasonable fee to help the project along. I don't see where I can buy version 4 so do I buy 3.76 and then upgrade? I don't want to be limited to one sandbox at a time. What would you guys on 7X64 recommend? I sort of think that either way I'll be fine. I don't want a "borrowed" copy and the free one isn't what I am going to use. I know what Sandoxie's site says but what is YOUR experience with my decision to be made?