A long ways to read below, but please read it all

Background: So about a year ago when I first started this game, I was pretty immature and what not, but over the years I started to get more involved and such with FH and was, like,
crying over not being able to get Aug22 or Items. Pathetic, honestly, I know. I would download it, but I was really terrible with computers, so I screwed up everytime I downloaded markings or items, so I sort of just stopped awhile ago. The main problem I had with the files was opening; my computer wouldn't ever let me open up to the items/markings.cfg and media files/folders. But recently(I have a windows Desktop) I made a new server, and ditched my mom's basically everything was refreshed(But I still had everything downloaded from my mom's server since it was still the same computer), and I downloaded the new Legendary Markings/Items pack, and it was
finally able to work(You would have thought me crazy if you'd seen my wayyy over-excited reaction). So I exported the files and copied/replaced them and merged them, and whatever else there was to do, and I
finally had the items and markings.
Important part now: When I was finally done and began to create some characters, it worked for a little while, but then a tab kept popping up named "FeralHeart.exe has stopped working." With an explanation under it something like "Windows could not find a solution to the problem. It will close out now and will notify you if we find a solution" Or something along those lines. I just shrugged it off, since it was already late anyways, and went off to bed, since my FH had done this in the past. But when I got on today, it wasn't working, barely, at all. I would go on my account, and if I clicked the arrow for too long to find a certain character, that tab would come up and I would have to close out. And whenever I went on and began scrolling the items and trying them on, the tab would appear, but with the markings, I was able to scroll/try them on for as long as I wanted. But then when I updated them and clicked on, the tab would either come on before I got onto the map, or like a minute after. I've looked at so many threads; I've deleted and re downloaded the packs, I've changed my rendering system, I've scanned my computer for viruses/bugs, I've changed some stuff to stop the lagging, and I've even tried going with no markings/items, not even the original ones, but it still won't work. Please, I've been playing this game for a long time, help me. Should I try re installing the entire game?