Random freeze on XP welcome screen

Hi everyone,

I've recently discovered a weird error on my operating system. When I boot up my system the window-loading screen usually takes around (20-25seconds), then followed by a 10seconds pitch black screen before showing the
blue-welcome screen.

And in here, my computer would sometimes *completely froze* disabling any mouse/keyboard interactions.
So far, the problem fixes itself whenever I do a reboot, it happens approximately 1 in every 3 boot up.

I've actually did a repair window with CD, and then it caused many other problems with my graphics cards, etc.... but now that I've fixed all that... it came back to this again.
 
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