i have asus a 68hm-k motherboard 4gb ram and seagate1tb hd i recently bought it and installed windows 8.1 and after installation i removed the pendrive i restarted my pc and it gives me ctl+alt+del and then put on pendrive and started stsrtup repair it shut down and turned on gives me /boot/bcd error cant use my pendrive wont go back i cant do anything now what do i do