Hi and welcome to the forums.
Would be helpful to know the spec of your computer, etc., but my first suggestion would be to re-download Reaper & when installing. it, choose the portable install option.
This bypasses your original installation & leaves it untouched, so any customisation you have done isnt lost, plus sets up a fresh clean install.
If that one gives you blue screens, we will have to think again.
Have a look at the free user guide and the excellent fdree video tutorials if you havent already
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