Hello. some keys like "6,y.u.w

If it is a laptop keyboard that is not working but you want to use an external keyboard just buy a usb one. Typically if you are running an windows xp or newer, it will just recognized the keyboard and you will be fine.
PS2 is that round plug with 6 pins you would find on older computers.

If you did not want to use an external keyboard and want to try to fix the the internal laptop's keyboard, there are a few things you could try:
1'st, shoot the keys with air duster to see if you can dislodge anything stuck under them.
2'nd, you can pop off the keys and press directly on the contact to see if the button works.
3'd, if that doesn't work you can take off the keyboard and ther will be a part number on the bottom of it. type that into google and you can find a place that sells replacement keyboards.
I did this on a Toshiba satellite and it worked fine, just be sure not to break the keyboard ribbon connector on the motherboard when you remove it.