keyboard malfunction

Yesterday, twice, my HP laptop just quite working. My mouse pad was working,
but I could not type anything. I was trying to type a search in internet
explorer, when that didn't work, I tried writing an email. Still no luck.
What I did was to reboot. Then I was okay, but it happended again last night.
I gave up and shut down. This morning, as you can see, it's fine.


Anyone have any ideas why this happened? I did check my keyboard driver, it
said it was installed correctly.
Thanks for any help, I run vista home premium.