On laptops, it is common for crumbs and dust/debris to get under the keys on the keyboard. Try giving the keyboard a clean with a vacuum cleaner. If this doesn't work, you will most probably need to replace the keyboard, it isn't difficult or expensive.
SOURCE: Sony vaio VGN-FS640/W Keyboard Error
Check the key isn't stuck down first, if not you may have a corupt driver, go to my computer< right click>properties>hardware tab>device manager and then in the next window, go down to keyboards, click on the'+' sign and right click on the line and select uninstall. Restart you pc and the keyboard will be re installed automatically and the driver loaded. Try again.
SOURCE: DRIVER for Laptop SONY vIO MODEL 933A ( PCG 933A )
looking for sony vio vgn-cr34GN/b winxpp drivers
SOURCE: Sony Vaio VGN-SZ460N - freezes on System Recovery
I put my money on that you have a CPU over temperature problem, and/or intermittent RAM problem.
Be sure you are ESD safe when working on the electronics as follow !
I suggest, using a eye piece magnifier and a wooden tooth pick and carefully touch each pin of your RAM sockets and see if the soldering is bad, allowing the pin to move slightly. If that happens, well it needs re-soldering there, make sure you use leaded solder, not the ROHS crapp.
If that turns out to be ok, then check your processor. It might over heat.
You may want to observe if the CPU fans runs at all and if it runs at full speed most the time, even if you don't run any 'heavy' programs. This usually would indicate poor heat dissipation. Most Sony Laptops have a piece of thermal foam pad is used for heat transfer from the CPU chip into the heat sink. Over time this pad shrinks, effectively impeding the heat transfer causing the CPU to over heat and intermittent shutdowns ect. I suggest, find a new piece of thermal pad or replace that with a piece of copper sheet material and use Thermalloy transfer paste.
SOURCE: My Sony laptop cursor jumps around when typing
Yes, you are accidently hitting the touch pad.
Trust me--that is what is happening. Some laptops have VERY sensitive touch pads. If you can disable the touchpad and use a mouse, do it. (that is what I do, as I suffered the very same problem.)
On one customer, I had to actually open the computer and disconnect the pad.
If you can't disable it (many new computers have some sort of switch to disable it, even if it's a combo of the Fn key and one of the special function keys, practice better hand position--raise your seat or lower the laptop to keep your wrists from drooping and getting your thumb near the pad.
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