Dont listen to the trolls. I know exactly what it is, and why you are hearing the noises.
First of all relax - The good news is that its NOT a virus...
The bad news is, that its a worm. The ones that create the noises (like typing) are the cable worms...
So, you DONT NEED a NEW PC - You DONT need to Re-Install windows... You just need to replace the cables.
Get a brand new monitor cable, replace all USB cables that plug in, and get a wireless mouse and keyboard.
The less cables you have the less chance of the cable worms returning.
And dont worry about the fan either - Provided its working - Worms cant get through the fans as they sliced up
