is there any third party converter from smf to vbulletin that will move the members and threads/posts. because impex is not working for me. can anyone please help.
There is something that vBulletin provides for free called IMPEX, follow the instructions from SMF to vBulletin (x.x.x) on the vbulletin site and it should help you transition from SMF to vBulletin easily.