if you become a vampire. and then try to start the companion quest line will it work ? as you cannot progress into the circle without becoming a werewolf ?
can you create a mix ?

i think the beastblood over-rides vampireism.

i know for sure tho at this present time you cant becone some sort of hybrid...

no you can't progress in the compains questline without becoming a werewolf

There is a better place to post this, it's the Cheats, Hints, & Spoilers sub-Forum.

Before anyone can help you with an answer, this would have to be re-posted there.

http://www.gamesas.com/forum/178-skyrim-cheats-hints-and-spoilers/

thats what i said. sorry if i was unclear.
the question was if you can be a vampire but get the beastform ? seeing as they wouldnt really overide each other ( that i can see anyway )

Only by exploiting glitches or using the console, and doing so will cause serious problems because the mechanics of the two conflict.

The normal situation in the game is that becoming a werewolf removes your vampirism and prevents you from becoming one.