Ya, when I first installed the update yesterday, my screen was like flashing, and when I tried reinstalling the graphics driver, it was saying access denied, but it's all working perfectly fine now after doing the repair upgrade thing
And no, I deleted the Windows.old folder and the restore points that the update made, because I usually never have a problem with system updates, so I usually just delete those right after updating to save space, but I am going to save the restore point after reinstalling the update just in case...
I just ended up just reinstalling the 24H2 update, by going to System->Recovery->Fix problems using Windows Update, in the Settings app, and it fixed the graphics driver