How to fix video glitch Minecraft Feed the Beast?

I've been having a glitch with my Minecraft Feed the Beast, in which invisible lines go through blocks, and my character has lines outside himself. I've been having for a few weeks now, and it happened after I started doodling on my computer settings trying to fix a crashing problem. It has been happening on all the versions of Feed the Beast and on vanilla, but fortunately on vanilla it only has the lines on the blocks and is easily fixed with Anisotropic Filtering all the way up to 16. I downloaded Optifine and adjusted the the anisotropic filtering on Feed the beast Unleashed, it fixed the lines through blocks but not the character. I tried downloading Optifine on Magic World 2, and did the same thing, but it keeps making me crash even though it was fine without Optifine before. I was hoping somebody else had a solution before I wipe my PC completely to fix the problem.

Added (1). I have deleted the.minecraft and everything I could, and it still comes up with the bug.

Is this desktop good for my needs?

Hi, i'm looking at this desktop, http://www.bestbuy.com/...Id=6980021

I'm wanting to know if it is good for games like Sims3, Watch Dogs, Assassin's creed, and like minecraft and stuff. I see it has a "quad-core". Which i don't know what that is but i know that there's like the intel core i3, i5, and i7, i7 being the best for gaming. So is a quad core good for gaming? I mean i don't even know what it is so lol. Please please please give me some advice!

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Do you think games that have almost to no story line are better then?

Games that have a good story line?

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Where can I build a custom gaming laptop or find one for under 400ish dollars?

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Names For Characters In A Story?

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Baby Girl ( Human ) - Skylar*

Baby Boy ( Wolf ) - Tucker*

Baby Girl ( Ocelot ) -

Mom ( Wolf ) -

Dad ( Wolf ) - Briggan*

Mom ( Ocelot ) -

Dad ( Ocelot )

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How long is a business day(simple explanation)?

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