Use
iZakaroN's SaveEditor (or from
Kiya's site, with description) to remove a skill point or two from Magic Barrier. Someone else ran into this problem if the skill points from the skill and equipment bonuses added up to more than 5 (or was it 5 exactly?).
If that doesn't help, you can use
DAD's item editor to re-create some of the equipment you have, minus the spell bonus. This editor can add passive damage bonus skills to weapons, but can not edit the skill bonus to your own skill set.
You can use the save editor repeatedly to raise your resistances. The resistance bonus when learning Magic Barrier is applied immediately, so if you remove all skill points from it, load the game, max the skill, save, edit and remove skill points, load and re-learn the skill, you can slowly replace the lost resistance points.
The stats of random items are stored in the items.000 file, and the problems trying to transfer such items between saves is described in the
Lost Items post.
