Random Outland Client Crashes

Ever since I downloaded the BC client I've had random client crashes. I've noticed it's worse when I'm in Org or Xroads. Sometimes I'll make it 5 steps before the client crashes and other times I'll make it half-way through the city. I'd like to add that I don't have any addons. I'll put some of the error report below. I'd love some help on this problem.
4.2 works fine as well as 3.3.5, but 4.2 is buggy as hell and I don't want to wait an hour to log into 3.3.5 when I only have 90 minutes of play time.

This application has encountered a critical error:

ERROR #134 (0x85100086) Fatal Condition
Program: C:\Users\nicho\Downloads\World of Warcraft - The Burning Crusade 2.4.3\Wow.exe

Failed to read data.



WoWBuild: 8606

Maybe you didn't download your client correctly (check data using the bittorrent client) or maybe your hard drive or RAM are screwed (do other applications or games crash?).