I bought my new HP laptop about 4 months ago and It was really working fine and smooth since I downloaded a Photoshop font pack which ended up as a trojan, then ads started flooding into my desktop and browser after some time i managed to remove the virus but the problem is that whenever i watch YouTube videos the sound starts crackling and the video lags,even my cursor moves by itself sometimes everything just works fine usually when i just booted up but then when i play videos on browser the problem starts again
my brother uses this laptop too so he has a local user account. when he watches youtube videos he doesn't get the video lag but he gets a slight sound crackling, I've created another user it has the same problem
tried changing antivirus from mcafee to bitdefender 2016 paid for nothing, tried malwarebytes nothing either,trojanremover not working
i tried searching for fixes some people said it's from the audio driver cause it isn't up to date i updated it same problem video driver tried updating it still not working
the most thing that annoys me more than the problem itself is that i just bought the computer recently,please help................