I'm assisting someone with their newly bought laptop. I'm not real used to windows, been on Mac for a long time now. We did some manual uninstalling of things, got them setup with their existing license that they still had for office 2016. We also had to change the GPU drivers for intel ARC to the official ones from NVIDIA in order to run Premiere. I also ran the powershell script Windows 11 debloat found here https://github.com/Raphire/Win11Debloat . Which, with no particular evidence, I do have some suspicions might be where the issues has arisen from. I mostly just wanted it to disbable telemetry but I did remove a small handful of applications and disabled some other settings with it.
Anyway, we've noticed now that opening some PDF documents resulted in inconsistent text rendering, some words had dodgy kerning, some characters were missing bits of a letter, and all letter 'a's simply didn't render at all. Worst of all, when they copied text from the PDF and pasted elsewhere, completely different text was pasted. This persisted using Firefox to open the PDF so it's not narrowed down to just Acrobat. Also in Acrobat, opening PDFs returns an error message along the lines of "the font 'KLZARO+EX_CFF_Wingdings' contains a bad /BBox" though whatever bizarre random combo of letters and numbers font name is displayed in this message varies. It looks like we have corrupted system fonts.
Is there a good way to fix this?