Hello, From a few days I have problem with my 9th it works very slow, I don't know why, I don't have any virus, because I checked it by diffrent programms and now I am thinking about clean instalation 8.1 with my DVD disc (I don't want to use recovery, because there is normal 8 and I would have to do update to 8.1, it is waste of time), and I have a few questions, before doing it, because always I did normal format + drivers from page of producer notebook, but this notebook is a little different (fast start, fast start from sleep mode, etc): 1. I want to do clean instalation without deleting recovery disc, because I read that service can't repair it without recovery, so I am going to format disc C and instal clean instalation. 2. Install all drives from SWupdate and intel site. 3. What with "fast" things? I have to do something? IRST wasn't on windows 8, wasn't it? or I have to install, do something else?