voltz (and other tekkit packs) keep freezing when updating

[jewanator123]

hi i am having trouble with tekkit. it keeps freezing while i am updating a pack such as voltz. eg it will say downloading 30%fml_libs15.zip then it will just freeze i have tried re downloading and deleting the tekkit folder but it does the same thing over and over again it use to work  but recently i updated my graphics card on my PC but i don't think that would make a difference please help!