Volcorb321

I recently got my mc accout back after 2 years so i thought Lets check on Tekkit so i saw B-Team Amazied by it i downloaded so i loaded it up and it pops up after a few seconds the screen says Minecrraft is unresponsive Now this happen with FTB but not orginal Mc so i dont now what to do i will try to see what i can do i really need help