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If on a Desktop, it's best to buy a new keyboard. On a laptop, where the kb is fastened to the case, try blowing out from under the spacebar with compressed air. That kb can be replaced too, but it's a hassle.
Yes there is a solution to that. You have an on-screen keyboard pre-installed on your computer that came with the operating system. What you need to do is
If you are running Vista or Windows 7
Go to START > ALL PROGRAMS > ACCESSORIES > EASE OF ACCESS click ON-SCREEN KEYBOARD
If you are running XP
Go to START > ALL PROGRAMS > ACCESSORIES > ACCESSIBILITY click ON SCREEN KEYBOARD
A keyboard will pop up on your screen that you can use with your mouse button.
Of all the keys on the keyboard, replacing the SPACEBAR is probably the most difficult. The SPACEBAR is kept even by a metal wire that is inserted into slots on each leg of the plastic bar key. However, you have to get the wire into the slots without depressing the wire. If you push the wire down, you compress the wire and installation becomes impossible. As a general rule, do not remove the SPACEBAR unless absolutely necessary. If you remove the SPACEBAR, remove several surrounding key caps also. This will let you get some tools under the SPACEBAR wire later on. Once the SPACEBAR is reinserted, you can easily replace any of the other key caps.
If you take all those tiny screws out of the bottom of the keyboard you'll see a circuitboard with three copper "design" spots(usually 3) under the spacebar..........the ones NOT in the center of the spacebar are dirty. You could use some alcohol or acetone to clean the outside "designs".....(warning) Acetone will damage plastic!!!!!!!! there are a lot of rubber caps that WILL fall out of place when you turn it over) (the actual keys could fall out too) (Be careful when you take off the bottom of the keyboard!!!!) Clean the ones that align with the SPACEBAR!!!! Dont touch or clean anything else that wasn't working....... Gently place the bottom back on and screw down the bottom cover with a cross pattern.....(left>right...top>bottom).....If this dosn't work....the best part is that a new keyboard........is fairly cheap....mtg
The spacebar is the most often used switch on your keyboard, so, yes, it's from overuse, but also from the fact that it is the longest key on your keyboard and the closest to the edge, all of this combining to make it the dirtiest key on the board.
So, get a keyboard cleaning kit, either professional or DIY which would consist of the following, cotton swabs, compressed air, and maybe a toothbrush and realize that all the stuff that accumulates under your keyboard's space key makes it harder to depress to the point where contact is made.