am yisrael chai-
I’ll start with what’s probably a dumb question: Is your computer still under warranty? If so, have a pro fix it on their own dime.
Here’s advice from someone who’s not a “computer doctor” (that implies a level of professionalism and expertise), but rather a “computer potchkerer” (self explanatory).
Popping keys off and putting them back on is a risky proposition with laptop keyboards and their scissor-type key mountings. I’ve done it several times as a last alternative, with about a 60% success rate. Don’t try it except as a last resort.
Desktop keyboards are constructed differently, and I’ve had a 100% success rate removing and replacing them – I’ll even do it lechatchila just to clean underneath them.
OK, now for the bad news.
Keys that stop working, “overwork” (create repeat strokes for a single keypress), or type the wrong letter have always, in my limited experience, indicated a “shot” keyboard that required replacing. This has occurred when something spilled on the keyboard. Even when the spill dried, the problem remained.
There’s nothing to lose by trying to blast under the keyboard with compressed air, and I’d probably try it before operating, but don’t get your hopes up.
Now, the (possibly) good news.
If you Google “<your model> replace keyboard” (sans quotes), you’ll likely find instructions with pictorial illustrations that some kind person(s) posted. It may not be that big a deal to replace the keyboard. Personally, I’ve changed my keyboard three times (don’t ask ) and removed a circuit board to solder, all using how-to info posted by someone else. A mini screwdriver set from Radio Shack may be the only tool(s) you need. Obviously, there’s some risk involved.
A replacement keyboard can usually be bought pretty cheaply. I got two new ones for $20 – $25 apiece, and a used one for $12 – $13.
Since I need my laptop PC for work, I borrowed a USB keyboard from my job and used that until I changed the notebook’s keyboard – perhaps you can do that as well, for now.
If you’d like to post your model number here, maybe someone can take a look at the keyboard replacement procedure and opine on the degree of complexity involved in its replacement.