I have an old windows 7 computer that kept crashing on me several times throughout the day for no obvious reason. This computer is a Hewlett Packard(HP) "Elite", which was state-of-the art when it came out back in 2009. After sending this computer back to the manufacturer several times and spending hours on the phone with HP customer service due to the crashing problem, I thought they/we finally had it fixed. The computer worked fine for several years after that crashing only once or twice a day, but lately it started crashing again. Sometimes 10 or more times per day ! Finally I decided to replace it with a Windows 7 Dell computer I got off Amazon. The reason why I stuck with Windows 7, is that some of my hardware, printer, scanner etc will only work on Windows 7. Anyway, I was tying to transfer Photoshop CS5 and Lightroom to my new computer, when I realized I did not have the original serial number ! I called the folks at Adobe and even though I showed them a receipt with a transaction number and account number they said they could not find the serial number, because it was not registered with them. They said the serial number is usually on the sleeve of the disk it came with. Of course if I had the original sleeve I wouldn't be calling them ? I tried several things such as downloading a set of keys I found on the web, but none of them worked. Then I tried going to the "application" file to see if the key was embedded in the start-up XML file: C: Program file/ Adobe/ Adobe Photoshop CS5.1/ AMT/ application 926287053123815334279360 Unfortunately, Only the trial-key was embedded on the XML file, no sign of the real key ? I then connected my old computer which has Photoshop CS5 and Lightroom on it, to my Monitor and started up Photoshop. I went to the Help menu and clicked on SYSTEM. I got a list of parameters including the Serial Number. Yeah, I thought I had Adobe beat ! However , when I plugged in the serial number I was 4 figures short ! The first 4 digits were missing from that serial number. RATS ! Adobe went out of their way so people could not steal their software, but at the same time they made it hard for people switching computers down the line ! This is when I realized since I could connect my old computer to my NEC Monitor screen, maybe I wouldn't have to send it to the Dumpster where it belonged. My monitor has 2 ports one for DVI and another for VGA . My old computer has to be connected via VGA, because it has a video card, but my new computer which does not have a video card can work form the DVI port. Problem Solved ! I will use my old computer strictly for editing photo's since it only crashes when connected to the internet. And use my new computer for internet related stuff. It's a little inconvenient, having to switch from one computer to the other, but at least I can keep the thousands of photos I have saved on the old computer without having to transfer them over to the new computer, hogging up space. Unless anybody has better ideas ?