Forum:Is there any way to fix my account?

A few months back, my friend accidentally deleted everything on my hard drive, so I made 2 new Borderlands characters; a Hunter and a Siren. My main focus was the Hunter. Got him to 61, Beat all the DLC, etc etc. However, I left the Armory for last. I go to the Armory, Beat Knoxx, but I forget to plant the munition thingy to turn in the quest, so I accidentally go into the chest room without turning the quest in. Now I can't beat the Armory on Playthrough 2, can't Crawmerax, ETC. I was pissed so I went on my Siren- And did the exact same thing >.>

After this, I basically quit Borderlands. But I wanna start it back up again, so it (hopefully) solve theproblem, does anyone know how to fix this?