Not that you deserve my help but mr dick is right. It's your mouse. The first sign of mouse troubles is usually the crosshair starts flicking up or down on spawn or randomly through the game. IN your case it's getting stuck on walls. You may have a forward movement bound to a button on your mouse or wheel? which is why it runs up against walls. Try a new mouse.Secondly the beeping is normal. If you press 2 movement keys together or hold them down it starts beeping
Watching porn to close to your keyboard can sometimes make your keyboard sticky
Clearly you're here to make the world a better place. Thank you. No, really, thank you. This isn't sarcastic passive aggressive trolling at all, in case you need help in the vision department. It's highly unlikely that it's a physical keyboard problem. If anything, he'd hit a key and NOTHING would happen. Network issue? I was gonna suggest that at first, but it appears the demo is a DM on your own machine. If mouse and keyboard inputs are lagged, then it's either a config setting gone awry, or a driver not working properly. You said the config was fine, so... it's likely driver related. If your keyboard is USB, try plugging it into another unused USB port. You didn't do something like attempt to overclock a USB port did you? Those kinds of changes can sometimes be impossible to reverse and damage the hardware.Or you could have some kind of malware running in the background that is taking up the resources the mouse and keyboard would use to report quickly. Which isn't exactly "driver" related, but kinda. You'd probably notice lagged behavior with your browser and other things too though. Maybe try some different scans for rootkits and such, or use the Windows Backup thing to revert back to an earlier state before it occurred.