Looks like Calibre is compatible with 8. When you installed 8 did you transfer all files and folders (apps)? Not recommended in my humble opinion as you transfer Norton. If you have the Norton licence to hand try a refresh reinstall. Right corner (with mouse pointer) settings, change pc settings, general, remove everything and reinstall Windows. If you get the option to transfer anything, select nothing and start again. Re-download your Norton Security. See if that helps.
Remember to backup all your docs, photos etc. before you try this.