Hi Everyone, I was playing a video file in Windows Media Centre and when I closed the application I noticed a 'This copy of Windows is not genuine' watermark displayed on the desktop. Fortunately opening up System Properties and viewing the activation status removes the watermark from the desktop. I noticed this once before after playing a movie in Windows Media Player, and viewing the activation status also removed then watermark then too. I wonder if this is a bug with certain types of media files somehow interfering with Windows Genuine Verification technologies built into the operating system. My system specs are: Gigabyte GA-EP45-UD3LR motherboard with Dell SLIC 2.1 Windows 7 Ultimate RTM OEM 64-bit (build 7600) with Dell MS Cert Intel Core2Quad Q6600 This does not appear to be a problem as confirming the activation status in System Properties removes the watermark when it occurs, I was just wondering if anyone else has experienced a similar issue. I would be interested to hear your thought. Shane.