Obsessive Compulsive Disorder when someone has it can destroy their lives, I have had clients who have to repeat every step on the stairs 5 times, flicking light switches on and off a set number of times etc.
However for me, I have this thing where before I start to study, I have to completely clean my office space, wipe down surfaces, organise material, change cat litter, hoover the room, then it spreads to my bedroom, toilet/bathroom, kitchen, living room, until the whole house is absolutely spotless.
I have to actively remind myself to stop otherwise I can spend 5hours cleaning house, before even starting my studying, or work. In regards to my computer, its just ensuring that I have a clean and organised desktop etc.