Because it happened to me that I checked a script of the toolbox and the Roblox studio automatically crashed and then I already entered normal it seemed strange to me that by opening a script that had a lot of text the studio was closed and a backup copy of the script is generated I think, I go here because I have doubts at the moment or if they have had any similar experience
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No they can’t, they can just mess with your game files.
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Hey,
No. They can’t. However be careful with what you get from the toolbox, it will ruin your game.
People who think they are hackers will try to sabotage. If I were you I would only use Roblox’s assets from Toolbox.
To be more specific:
a Roblox LUAU script run on your studio can only affect what happen in your studio when it’s run, it has no effect on your Computer. it cannot run .exe file, so you are fine.
However, like the other said, you should pay attention to the script you use in you game, as they can be used a backdoor for exploit, to teleport player out of your game (if you enabled the option in your game settings) or mess with your game with lag, unexpected behavior and such.
So to conclude:
No, it cannot affect your PC.
No, not unless a new exploit is found where bad actors find an Arbitrary Code Execution exploit.
This will usually never happen and is very rare when it comes to open source LuaU, this project has thousands of eyes on it daily.
Not to forget mentioning though there was a case in 2022 where plugins were able to get this type of code execution privileges but they got patched pretty fast.
Roblox’s HackerOne bug bounty program offers money to any individual who can find a critical security flaw in the platform, with a generous money prize. 
Long story short, Roblox’s engineers nowadays know a heck ton of security measures, and basically have your back on these cases to minimize this to a point where barely any security flaws exist which can damage your device. 
There is basically no chance your computer can get infected by a toolbox item.