Ok, here's my situation: I want to install Windows 7 on a friends' computer, which at present, has no working OS on it. The tricky part is her optical drive is totally kaput. I've been able to find some instructions on how to make live USBs in leopard (like these), but so far, none of them have been bootable by a PC. When I try to use the disk utility's "restore" function, I get an error message saying "Could not validate source - error 254" I've googled around for other possible solutions, but haven't turned up anything. Has anybody here been able to figure this out?