I have been using Sony Sound Forge 10 for years. All of a sudden it quit working and would not let me open it. The that popped up said I would have to have "elevated privileges" to use it, requiring administrative registration. I clicked on the "next" button , and it all went away, still not working. I purchased the software some years ago at Fry's, but have moved and thrown away the box it came in. I've tried going to the Sony web-site to get the serial number, but it gave me a serial number that apparently is not valid because Magix will not accept it. I have searched everywhere on my PC to try and find the serial number in "properties" of the software to no avail. Does anyone have an answer out there?