Automatic use of up arrow key in pc

Hi guys, Actually my pc automatically presses the up arrow key in playing games like NFS Underground, GTA V, NFS Carbon and many other applications. I also tried detaching my keyboard from my pc but the problem still persists. So now I know my keyboard is not faulty here.
Will changing my windows help me ?
Or any other solution to the problem ?
Thank you in advance

My pc details are:
Windows 7 Ultimate 32bit
Intel E6700 Dual core 3.2ghz processor
Intel G41 express chipset 2gb ram

Sorry guys for not being active on the topic

So guys what happened was In games like NFS Underground, FIFA 2007 and GTA San Andreas, I experience automatic use of up arrow key even if the keyboard is detached.
So, when I switched from Windows 7 32 bit to windows 10 64bit last Sunday and the problem was solved but today I experienced the same thing again.
Please Help
Thank you for any answers.

- windows 10 64bit isn't a good choice with only 2 G of memory.
- The mouse wheel does the same as the up arrow key. Try changing the mouse.

Okay I will try
Thank you for the suggestion

Megahertz07 said:

- windows 10 64bit isn't a good choice with only 2 G of memory.
- The mouse wheel does the same as the up arrow key. Try changing the mouse.

What's the cheapest and easiest way to increase ram?

Megahertz07 said:

- windows 10 64bit isn't a good choice with only 2 G of memory.
- The mouse wheel does the same as the up arrow key. Try changing the mouse.

So, I tried the step above but no luck but I noticed one thing that when I unplugged my mouse before starting NFS Underground, the game crashed and reported that it had stopped working but when I plugged my mouse again the game launched and and then I unplugged the mouse again but it didn't work for me.

AshKing15 said:

What's the cheapest and easiest way to increase ram?

Replace the one you have with two sticks (4G+4G). Buy a little higher speed and lower latency than the original.
If you don't want to have memory problems, don't mix new with old.

AshKing15 said:

So, I tried the step above but no luck but I noticed one thing that when I unplugged my mouse before starting NFS Underground, the game crashed and reported that it had stopped working but when I plugged my mouse again the game launched and and then I unplugged the mouse again but it didn't work for me.

I didn't say to unplug the mouse. I suggested to replace the mouse.