My Windows 8, After a long time of using started acting very strange. I have NOD Smart Security as a anti-virus software did a scan on a system drive found some irrelevant viruses that i had,a win32 chub worm, but that's not the exact problem.
I remember having an adware that starts browser with a spammy startpage, but i deleted it now.
THE REAL PROBLEM is i don't why(even after having many experience with pcs) After some time or a random time pc acts very strange, apps like Steam, any other even task manager go nuts, I have screenshoting tool called Lightshot even that thing goes nuts, when i press PrntScrn it has to show transparent screenshot to click and size the areas of the shot, but it shows White or buggy screen when problems starts, Steam gives some errors like can't find some files, task manager asks for a admin permissions, UTorrent starts to display errors like "Not enough storage is available to process this command". Sometimes pc freezes with lack of memory (last time it froze couldnt open tskmgr). Then after i a restart it's all gone, but things like browser cookies, app datas like (Download Master's download list) are gone.
I really don't its a virus problem, or hardware, or corrupt OS.