"I" would split the Anadrol into 2 doses every day. (I think the half-life is like 8 or 12 hours...) I don't know about Arimidex, I have never used it. I think most guys in here will say not to take Anadrol and Winny together as they are both 17aa, and will be hard on the liver.
But, I would wait for a vet or a Mod to verify any of this.
.02,
Joker