Good morning to all and thanks to exist First, sorry for my bad English but I am Italian I hope to make myself understood. I have a huge problem with a new computer of one of my clients who after a few minutes of power begins to slow down dramatically and distort the audio. The computer in question is a new Desktop Asus BM1AF, a I5-4440 with 8GB of ram, nVidia GT620, and Windows 8.1 PRO. Thinking there was some problem during the various preparations have also tried to reformat it but the problem reappears immediately. I tried to follow the guide written by you but unfortunately I can not understand the problem, I have tried to perform these procedures: 1) disable HDMI audio improvements 2) updated bios and chipset drivers, LAN and video card 3) physically disconnected the front USB ports and card reader 4) run sfc / scannow and chkdsk I am attaching the two LOG, the first when everything goes normally, the second since the problem is ongoing. https://drive.google.com/folderview?id=0B6LqA7tts9LeLVNXOG1LR3dNOUU&usp=sharing Can you help me? What's to blame? that we have solutions? I am desperate Thank You Claudio