I am not sure if this is a malware problem, but I am vary suspicious that it is. I was given a computer and told it was running so slow as to be unusable and could I check it for viruses. The procedure that I follow when asked to do this is to boot to safe mode and run;
All of these found makware with MalwareBytes reporting several hundred objects, many of which it listed as Trojans. Once I did this the system seemed to be running faster and I rebooted to normal. Again it seemed fine but after a few minutes it just ground to a halt and became unusable. I again booted to safe mode and with one exception, it run fine. That exception was windows explorer which ran very slow, but did run. I then tried safe mode with network. This duplicated normal mode and quickly ground to a halt. I then retried safe mode with network, but with the network cable unplugged. This time it performed normally. I then plugged the network cable in and it ground to a halt again. Remove the cable and it returned to normal. I next ran task manager and saw that on startup there were 7 processes showing;
The CPU usage was ~6%. When I plugged the network cable in these processes started to duplicate, with 5 conhosts and at least 2 of the others and the CPU usage went to 100% and stayed pinned there. If I pulled the cable the processes started to decrease and CPU went back to 6%. Since conhost duplicated the most did a google search on it and saw that there was a rootkit that mascaraded as conhost and that it was suggested to run JRT (7.0.8 (06.22.2015:1)) and Gmer (2.1.19357). Neither solved the problem. Finally I ran ComboFix (15-06-24.02) again no joy. So I am at my wit's end and I am turning to you.
I have attached the logs from; Farbar Recovery Scan Tool, MiniToolBox by Farbar Version: 22-06-2015, ComboFix, Gmer, and JRT.