My PC after power on blocks the mouse and keyboard, is it a virus or what? After few second windows freeze and all the keyboard and mouse movement do not works.
I have Windows XP SP3.
How can I solve it?
You may well have solved it already, but a possible cause of your freezing and a solution are outlined here. (If you have XP Pro, that is - you didn't specify.) Worked for me.
(Sorry, I'd link to the but the relevant part is half way down the page. Furthermore, being a newb I can only use one link per post.)
If it's not that then I can't be very helpful; all I can suggest is to run