Hi

When i start to play games the mousepointer dissapers from the screen
I have noticed it on games like Age of Empires, Sid Meiers Pirates.
It also have dissaperd on Sid Meiers Railroads, but it has since reapperd again.

I havent changed any settings before or after, and it just suddenly stopped working.

Anyone has any idea what can be wrong?
Is there some program that could generat information about the system it would be easier to tell you my gaming spec. But its atleast Win 8.1 64 bits.

This "disappearing cursor" or "flickering cursor" used to be a known problem with video drivers in certain games, and could often be fixed or made less noticeable by reducing video acceleration. That was with Windows 98, but it might be worth trying in Windows 8.1 if your video card's drivers allow it. Here's an article telling how to reduce video acceleration (aka hardware acceleration).
https://www.thewindowsclub.com/hardware-acceleration-windows-7

I don't think the mouse would be the problem if it behaves outside of these games. If it's a wireless mouse you could check that its batteries aren't low.

Two programs that will generate lists of specs are the BelArc Advisor and speccy.
https://belarc.com/products_belarc_advisor
https://www.ccleaner.com/speccy

Do you know if your computer is set to automatically install video driver updates in Windows update? If it is, see if you can figure out if your video drivers updated around the time the problem started.