I’ve got a toshiba laptop, it runs on windows. Whenever I’m using the mousepad, without warning it minimises all open windows while browsing the internet, anything I’m working on basically. It drives us nuts, but I’ve no idea how to stop it doing it. Any ideas? It also closes all windows now and again, very annoying when you’re in the middle of posting on a message board! TIA, Me 
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i think your laptop got a virus..i don’t remember what it was..sorry
If this does not happen when you are using an external mouse, it would mean that your mouse pad is gone crazy.
These can be changed but depending on how old is your laptop, it might prove cheaper to get used to a normal mouse.
A good yet painful test to see if the mouse pad is damaged is a clean re-install of windows in case the drivers has gone corrupted, rare to happen, but it does happen I am afraid.
Good luck