Kinda weird situation here. Whenever the Win key is pressed on my external USB keyboard my laptop does whatever is set to happen when the power button is pressed on my laptop. E.g. sleep or hibernate. This does not happen when the laptop's Win key is pressed, only the external USB keyboard. I don't think it's a problem with the keyboard itself because I've tested it on my friend's Windows 7 laptop and it functions as normal. Also, after turning the laptop back on whatever I was trying to do with the Win key has happened. E.g. If I do Win + F the laptop goes to standby. After switching it back on the file search panel is open. I'm not sure when this started happening but it may have been after I did a registry clean with CCleaner. I always check what it's going to change and it seemed fine that time. I also keep backups of the changes which it makes. Restoring the backup didn't fix the problem. Any ideas?