Make lap top slower?

I know this question might sound a little strange. I have a very bad Windows 7 laptop and my parents will buy me a good PC if it gives up. So how can you do it in such a way that it charges for a long time, for example, on a website and does not work, can't connect to the Internet or the battery does not charge, etc. But not so obviously (e.g. The laptop does not start or the screen goes out) because my parents then become suspicious.

Use up a lot of memory

I've already tried.

And have you ever tried to download a lot of programs?

There are various viruses that make your laptop so slow. ^^

Yes, but my parents also notice this when I download a lot of unnecessary programs

:-(OK