Your windows shouldn't be an issue. Ebay sellers sell used versions of windows from old dismantled computers, so some are perfectly legit.
I'm not sure what GPT stands for either, but in my opinion, I would install your windows on a usb stick using the windows media tool, you can find on microsoft website.
Then boot from the bios and fresh install from the usb.
From there, you should be given an option to partion your hard drive, which should wipe everything on it and install from fresh.
If that's not working, then could it possibly be your ssd faulty?
I'd go into your device manager and check it's up and running alright.
If you're using windows 10, it'll automatically install your drivers for you but if 7/8 you may need to download from manufacturer website.
Hope this helps
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