cant attack whilst in vampire form?

[RayeKagari]

i can float and stuff and walk etc but neither attack buitton does anything

[traison]

I suppose I'd start by analyzing the transformation process, and locating the attack data entries for vampire lords, as that seems like what you're doing here.

1.  [02] Dawnguard.esm (051FCDC8) \ Spell \ 0200283B <DLC1VampireChange>
2.  [02] Dawnguard.esm (051FCDC8) \ Magic Effect \ 0200283C <DLC1VampireChangeEffect>
3. DLC1VampireChangeEffectScript.pex
4.  [02] Dawnguard.esm (051FCDC8) \ Quest \ 020071D0 <DLC1PlayerVampireQuest>
5. DLC1PlayerVampireChangeScript.pex
6.  [02] Dawnguard.esm (051FCDC8) \ Race \ 0200283A <DLC1VampireBeastRace>

Inspect files and records for mods overriding them. Inspect the race record's attack entries, as I believe those define how an actor can attack. Otherwise you got more generic things like maybe something disabled your controls. The epc console command would potentially sort that out temporarily.