malware can't be found in safe mode and the system shuts off in normal mode

[barononeefdip]

whenver i start the system in normal mode it shuts down after a few second (or atleast until the avg antispyware program detects the malware and asks me what i want to do with it then it shuts off and gives me a blue screen of death) but whenver i boot it on safe mode it will never find it so i am not able to get rid of it, is there a solution to this problem