Asus a7v600-x Bios problem

I've got an Athlon 2800+ and when I was installing drivers and programs, sometimes when i restarted the keyboard and mouse wouldn't work, so i went to asus webpage and saw that a release of a bios update fixed that. So i go and flashed the bios to the new bios and it somehow was corrupted or damaged and my computer would't start, so I put the old bios again, but now my windows xp is really slow.. it takes like 10 min to go through the logo with the bar below, and then takes even more to finalize initializing.

I thought that format and installing a new windows would help, but instalation is very very slow also.

What could be the problem?


Ps. I start a new thread since the other title doesn't relate to this problem.