Windows 64 bit vista, 4 GB of ram, no USB device. When you first install eboostr 4.0 build 529, it sees its your frist time and ask if you want to set up the devices, say yes. After witch the screen will come up, and the "Enable use of hidden system memory" will be uncheck/checkable. Check it and then it will thow a error at you saying you cant. After word it will stay uncheck/uncheckable.