Disabling the default function of the ALT key?

so my problem is:

I need the alt key while video editing, very often. When I press IT and another button all is fine, but if I happen to just tap it, it instantly highlights "files" in the top left of my windows and any other tap lets it jump to the next option. This is as frustrating as its annoying since pressing any other button afterwards can fk things up. I think this might be a relic of ye olde days when you didn't have a mouse or a proper UI for Windows, could be wrong tho, but just like the rollover key it feels obsolete, atleast to me. I tried googling a solution but im to autistic to ask the right thing without writing it out like this. Hope someone can help, its annoying as HECC

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