Startup Repair Problem

I have a Toshiba Satellite L305D S5938 with Windows Vista On startup some times it will get a Blue Screen and do a Crash Dump then go to Startup Repair after repair it will go to the desk top screen and sometimes it will say repair cannot repair this computer. I went and bought a new 320 hard drive and put it in and put window 7 on it. When I do the updates and it reboots it's doing the same thing on every other reboot. When it does go to the desk top it works fine