For reference, I have a Lenovo Y510P IdeaPad laptop. I can list additional specs if needed although I'm not sure if it's necessary or not. Anyways, so I've always been using a wireless USB mouse with my laptop and I've had no problems with it, up until a few days ago. I was using a simple Logitech wireless USB mouse, the kind that was no more than $20 USD. Well about a week ago, I found out the battery was dying and I had to replace them, but I waited a few days until I noticed a weird "lag" in my movements of the mouse. Sometimes the mouse would occasionally lag behind my movements - say if I move my mouse in rapid movements, it would show onscreen of much slower movements. So, I replaced the battery and reset the mouse. To no success, I still had the same issue, except I realized I was unable to move the mouse while streaming YouTube videos or playing games or it would cause severe lag on both the slower mouse movements and either the YouTube video would stutter/lag, or the game would lag, also causing this static-y sound to appear whenever it was lagging behind. So earlier today I picked up a new wireless mouse, this time a Microsoft one for about $15 USD. Let me just say that I have never had issues where I had to replace a mouse, except maybe once every 6 months to a year for other minor reasons. So, I installed a new battery, installed the new mouse into the laptop, and I am still getting the same issues. Sorry if this is long, but I am not extremely tech savvy in this wireless mouse department lol. I have looked all over the Internet and couldn't find anything that fixed the solution for me. I have Windows 8.1 by the way. Also, if it matters, I recently installed Norton 360 Security after my subscription was close to ending, and I also installed an older version of Direct X as well as install CCleaner. I don't think these problems affected this, but still. I also scanned my laptop for viruses and I am told by Norton that I do not have any viruses or anything. Finally, I tried to go into Device Manager and uninstall the USB wireless mouse drivers and reinstalled them to no luck. The only temporary solution I have as of now is to take out the USB for five seconds and put it back in, but that solution only works for about 5 minutes until it goes back to normal. Also, if anyone knows any solutions, try to make a step by step process or something because I have trouble finding certain things on my computer as it is lol. Thanks in advance.