Mouse and keyboard not working at welcome screen?

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Whenever I'm starting up my computer, my keyboard and mouse stop working at the welcome screen. I've been having to hard-boot (is this bad since it's from the welcome screen?) because I can't manually turn off the computer, and then physically turn the computer back on and open system recovery to be able to do anything. Once in system recovery my mouse and keyboard work, however the keyboard-mouse problem persists at the welcome screen unless I do a system restore. But even after doing a system restore, the problem starts back up again after one or two uses.

I have tried replacing the keyboard and mouse, and I have scanned to see if there's anything wrong with the ports (nothing's wrong). I am using Windows 7 and am the only one that uses this computer.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.techsupportforum.com/forums/f15/solved-mouse-and-keyboard-not-working-at-welcome-screen-570692.html

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