Because repackers often compress audio aggressively, go to your Sound Control Panel > Speaker Properties > Advanced > Change Default Format to 24-bit, 44100 Hz (Studio Quality) .
Repackers remove unnecessary language files, compress audio and video into smaller formats (like lowering bitrate from 320kbps to 128kbps), and use "lossless" compression on textures. During installation, your CPU works overtime to decompress these files, which means . cod mw 1 highly compressed