Keyboard Keys One of my keys on the keyboard popped off and i cant get it to pop back on

When were the last time they keys were working? The space, n and b keys are all right next to each other so you may just need to replace the keyboard. If it were me, I'd spray some canned air real good in the problematic area and see if that helps. If not, then I'd pop the keys off and see if the keys work without the buttons on there. Only issue with popping the keys off is that they can be a pain to get back on so be careful.
You can find instructions online about how replace your keyboard. It's not very hard to do and it's a relatively cheap fix if you can do it yourself. Good luck.

Step 1:
What sort Of stuck ?

A stuck key on a keyboard is one of those annoying things. The typical desktop keyboard has about 104 keys, a laptop keyboard has a few less. The problem of a stuck key can be a hardware or a software problem or the key itself might be the culprit.

Hit the key several times. This will almost always unstuck a key. Clean the keyboard with an approved keyboard cleaner. These often come as wipes. People sometimes spill food and drink that can make keys sticky. Pop the keys out using a small knife or flathead screwdriver. Most keys pop right out and can be pushed right back in place. Look for something that might be blocking the key and remove anything you find.

Clean the keyboard. Most of the keys can be safely "popped" out using a nail file or other thin lever. Don't pop out the larger keys, like the space bar, because they have a small wire spring in most models that can make them difficult to reinsert properly. Use canned air, a Swiffer, q-tips, or other methods (nothing wet, but a damp cloth that doesn't drip is OK) to get the obstructions cleaned away and then put your keys back.

Laptop keyboard keys will "pop" back on just as easily as they "pop" off.

place the key over the raiser. center it and give it a push. if the raiser or key sockets are not damaged it will just pop back in. Otherwise you will need to replace the key.

you can find boards on ebay. Replacing the board over the key is usually better. Many times people selling keys charge 7-12$USD a key where the board coudl be 20-30. Personally i rather get the new board but each has their own choice

I assume its a laptop. laptops some times get stuck keys, meaning one of the keys has not fully released after it was depressed. I recommend getting some compressed air in a can and give it a good cleaning. there might be something stopping git from popping back up. then give the keys a little work out. just mash the keys a bit. then turn it back on. if you still have an error, then you might want to consider replacing the keyboard. if you don't, it will not harm you pc in anyway...good luck

you can search ebay
or
http://www.individualkeys.com/servlet/the-14355/HP-DV7-Laptop-Keys/Detail

look at the bottom of the keyboard for a model or part number then try searching by that. You can usually find replacement keyboards on ebay.

its not impossable you have to be gentle and patient they will pop back in press down on the keys and kind of push the keys in an up then down direction slowly

go control panel, hit mouse and find default settings. hit default, ok and do a reset on your computer.
If you have a special install disk for your mouse when the system starts back up ,test your keys then install the disk(or CD). if this does not correct your problem , check to see if someone changed the language on your pc. If english, buy a new keyboard.

you have to remove individual keys they normally pop off by levering them easy not by hard force and you need to clean underneath them and pop them back on