Windows insane freeze

Oct 31, 2018
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I have recently installed Windows 2k on my Pentium 3 PC. Now the problem is, that the UI freezes when I'm clicking on it. For example:
I click on the start button and it takes multiple seconds to bring up the start menu. Browsing files is a nightmare; the UI suddenly slows down extremely and I am not able to move the cursor. It starts to work again after a few seconds (a lot of seconds).

Specs:
Intel Pentium III
128 MB PC 100 sdram
PowerVR Kyro II PCI
Acer v66lt Mainboard
40 GB HDD by Seagate

Update!!
The same thing happened on virtual box after I connected my 1TB external hard drive. I think this is the reason for this "system damage".