Dears,
referring to our discussion with Mr. Holger, here we can explain more our issue related to the USB infection:
when we select to do a direct USB infection, we have tick options to be selected as following:
1- Master Boot record of HD
2- Vista  Windows 7 user mood infection
3- Active hidding on target.

we do tick all the options above, to secure all the chances not to lose the target. we reach to know that once we select the first option ,which is very important to us, we get immediately an  error with a title: Generation infection faild.

Please note that if i disable the first option, the ganeration can be easily done. but we totally need the first option to be active while the generation. so please kindly let us know the solution as this is a priority. 
we had informed Mr. Holger about it. and he got a copy of the error. and i am attaching-uplaoding- the same picture of the error for your kind information