System is a Dell i5 3000 series, Win-7 Enterprise, 64-bit, 8gb ram, 1TB hard drive. Windows update is off. Last week it started acting up, taking longer to shut down, not being able to find the printer, and erratic mouse movements. I tried to diagnose the problem but couldn't pinpoint the cause. When I first set up this or any system, I create a base image on a separate hard drive (Western Digital) , and then create an image using Acronis and restore the image to another hard drive (Seagate), and that becomes my daily driver. Once a month I take out the base image (Western Digital) and make any changes that need to be done and create an image and restore the image to the Seagate hard drive. So when the problems cropped up, I just restored the August image to the daily driver (Seagate) and everything worked fine. But whenever I logged onto Twitter, or a Credit Card site they said that the computer was unrecognized and I had to go through the security drill or confirm it was really me. Oddly enough my Bank didn't complain, neither did Gmail. What puzzles me is that I used the same image to first create the August Daily Driver on the Seagate, and then when problems cropped up, restored the exact same image back to the Seagate, after formatting the C:\ drive. I've done the procedure for years, and never had any problems with any of the web sites complaining that the computer is different. The only thing I can think of is that every time I restore an image I have to re-run KMS Pico to validate Win-7 and Office. But I do that every month and never have been challenged before. Twitter is still complaining after a week, but that's the only one. Credit Card companies, and the banks are all OK with everything now. It's not a big deal, but I'd be curious to find out why the same Acronis image on the same computer showed up as a different computer on some sites. .