Was using Krita and Gwenview at the same time, they started to lag so decided to restart the computer. Once restarted they would not open, reinstall or uninstall. All other similar programs like GIMP and gthumb are working fine with no issues. When I try and start Krita and Gwenview in the terminal it simply says "Bus Error" for both. Not sure what I did wrong, does anybody know how to fix this? T_T

Not directly, but try to use another KDE application. If that also gives this error, there's likely something wrong with the libraries or settings. Create another user, and if that user can run krita or gwenview, it's the settings, if that user also has the same problem, it's time to check the health of your hard disk and if it's fine reinstall, if not, replace and reinstall linux.