trojan.gen.2 and trojan.zeroaccess.b removal help!!!!!

I need help in removing the trojan.gen.2 and trojan.zeroaccess.b  i've been running combo fix and it has been working on trojan.zeroaccess.b but not on the others i don't want to resort to reformatting my laptop

 

***note*** they both gave me the bsod as well and the bs code was f4 it happens on startup.