My laptop is a Dell 15 3000 series I3 and is a two weeks old and has up dated to the latest version of Windows 10. It lags too much. I can't even finish a 2min song without it sounding like a scratching disk. I've reloded the softwere and have an antivirus (McAfee). It still lags horribly. Ive also ran the hardware diagnostics but it has no problem there. I don't know what to do. please help