Try turning off your antivirus. If that didn't work, here is a solution from the Technic forums:
Download minecraft.jar manually for the modpack you need. As some modpacks run on different Minecraft versions, please choose the modpack you want to use: Tekkit,Technic, Yogbox, Hack Slash Mine, Voxel Modpack
Rename the minecraft.jar to minecraft_1.2.5.jar (Tekkit and Technic), minecraft_1.2.3.jar (Yogbox and Hack/Mine), minecraft_1.3.2.jar (Voxel Modpack)
Place the renamed file into %APPDATA%\.techniclauncher\cache (you can open the start menu then type %APPDATA% for quick access).
Launch the launcher, select your desired modpack and it should work.
Wow thanks for the quick reply. Is there any thing I can do (like edit the interface) to fix this? I cant find the correct texture in my minecraft folders
Im getting an odd issue where the grid is misaligned... So when I craft something it goes into an inventory space that doesn't exisit and I need to move it by hand. Here is a pic... http://imgur.com/7pqq3
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It is a pre-release... Did you even read the OP? Red matter is gone, Collectors are gone, condensers are gone along with a lot of other items
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http://imgur.com/7pqq3