Trojan.Gen, Trojan.Gen.2, Trojan.Zeroaccess.B

Initially i used to get Trojan.Gen, The Trojen.Gen.2

and today Trojan.Zeroaccess.B which made my laptop simply useless.

I have Dell Precision M4300 with Vista and Norton installed. I followed instructions posted by Norton but no results.

 

I tried to follow instructions posted by Quads and downloaded FRST into my flash drive.

Unfortunately the F8 does not bring up the advanced boot option. 

I run FRST.exe under safe mode and here are the results.