Missing Laptop key board keys.

try this
https://www.computerhope.com/issues/ch001245.htm

Unless I'm missing something, just put the key back where it belongs. Push down hard, and it'll snap back into its place. If this doesn't work, check the underside of the key. If you see broken plastic, you'll probably have to find a new key. Acer laptops seem to have a problem with keys coming out and breaking (just look at the number of times this question has been asked!)

hope this helps

Here you go, http://www.replacementlaptopkeys.com/servlet/the-16937/Acer-Aspire-One-D255/Detail
They have the acer D255 laptop keys you need, take care.

install an application called 'Launch Manager' That will help. You didn't say what model? Acer Extensa 2000/2500 Series --- Far right launch button above the keyboard
Acer Travelmate C Series ---Far left hot key and then choose WLAN from menu that appears
Acer Aspire 1000 Series --Launch Keys above the keyboard
Acer Aspire 1640Z ---- Launch Keys above the keyboard
Acer Aspire 1690 ---- Launch Keys above the keyboard
Acer Aspire 2000 Series ---- Button on the front of the laptop
Acer Aspire 2012 ---- Launch Keys above the keyboard
Acer Ferrari 3000 ---- Button on the front of the laptop
Acer Ferrari 3020 ---- Button on the front of the laptop
Acer Ferrari 3400 ---- Button on the front of the laptop
Acer Ferrari 4000 ---- Button on the front of the laptop If you don;t have the drivers go to the Acer site and download them, and install.

You can get a replacement key from ebay for around 5 dollars. Or you can also pilfer keys from a broken keyboard.

Not all Acer keyboards are the same so make sure you find the right one for your system before ordering.

Replacement keys are usually specific to your model laptop/keyboard. If you are missing some plactic hinge components an the rubber hat contact, then you need to replace the keyboard.
There are companies on the Internet that supply replacement keyboards, Google search for replacement keyboards for your model laptop.

you may have shorted your keyboard (spillage??)

if your laptop is outside warranty you can check the connection to the keyboard, by removing the top bezel, undoing the keyboard retaining screws and then check that the ribbon cable for your keyboard is seated properly, If reseating this cable does not work the you can always order a replacement for your keyboard, you can find the part number for the keyboard you have, it should be printed on a tag on the reverse of the keyboard.

Ebay is the best place, or a small computer shop that sells used laptops. On Ebay there are several vendors that sell individual keys, however, you may be able to get a good deal on an entire keyboard, then you will have many keys for future mishaps.

1. Remove 3 screw from top of laptop. this screw hold power cover (cover which have power button).
2. Remove power cover.
3. remove 2 scews that hold keyboard.
4. that's all, you can take keyboard out from laptop.

i hope this will help

In most cases the entire keyboard needs to be replaced. Your best bet is to contact the manufacturer to purchase the keyboard as laptop parts are 99% proprietary.