|may be its virus, but it can be sth else,|
i think you use lots of softwares and these reduces your pc speed.
i think you can log in to you oc with using "safe mode".
With some computers, if you press and hold a key as the computer is booting you will get a stuck key message. If this occurs, instead of pressing and holding the "F8 key", tap the "F8 key" continuously until you get the startup menu.