I think we have two different problems here, at least one person in the other thread on this has fixed his search by applying the latest Win10 update with no changes (at least that he reported) to Fritzing. I'm pretty sure your problem is related to corruption in the temp directories. I have the luxury of multiple machines so I can try things on a non production environment, but that said I've never had a problem renaming the two Fritzing directorys to try something and then moving them back, but I also have a complete system backup that I can restore quickly if something does go wrong. As noted earlier it is also a good bet to export your created parts and save the resulting part file and all your sketch files on other media to guard against a disk failure.
Peter