Sometime i can't type anything with my keyboard on my computer why?

Could be a hardware or software problem, not enough detail to tell, however..
Before you try anything remove all external devices and see if anything changes. Sometimes external device drivers can prevent KB working.
Is there an icon the bottom left corner of the login screen? If so select Type without a keyboard and an on-screen keyboard should appear. Use the trackpoint/pad (or mouse) to log in.
Now check the keyboard to see which if any keys are working.
Let us know how you get on

Hello.

The computer's keyboard driver is outdated that's why it's acting like that. It will get fixed by updating it. Go to the Device Manager.

Right Click on Computer. Click Manage. Then go to Device Manager.

Right click on the keyboard driver and click on update. You can also use RadarSync if you want to make sure that all drivers are updated so that you won't get any failures in the computer. You can get RadarSync from here http://radarsync.com/driverupdater

Let me know if you have any questions.

David

you have to replace the keyboard

here is how to do it

http://www.youtube.com/watch?v=m25N1eZj1FQ

here is the part number to order
Item Number: 330-7359. Part Number: RRGD8

when you say the keys stick, if you mean they rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrepeat then its your keyboard if you mean there is a long delay when you are typing then all of a sudden the words just catch up then something is occupying your processor time (its not internet connection as content is usually only submitted to the net when you press enter)
press crtl Alt and delete (assuming ur using windows)
click processes
click on the colum header (CPU) if anything is using CPU fore than 50 other than system idol then especialy when your computer pauses then that is you problem.

have you tried hitting the "numlock" key? Sometimes it is accidentally hit and that will cause your keyboard to fail to respond to average typing.
In addition there might be a key lock button on your laptop.

Hello
Ask him to unplug keyboard from pc,while pc is off.

Then restart pc.once it is running plug keyboard back in.

Change your mouse

It could be that you keyboard is clogged with dirt (e.g. bread crumbs- do you eat while sitting at the computer?).

Turn over keyboard and give it several taps. You may be surprised what fall out sometimes!

Also it may be useful to use a clean paint brush to dislodge anything stuck between the keys.

Have you tried a different keyboard ? To find out if something is going on with the computer or keyboard, try another one to see if it works, if you don't have a extra one around, borrow one fron a friend.

just go to device manager and then right click your keyboard in there and select properties and select resources tab and tick bring this device out of standby