probelm in Enterprise miner

Hi

I am using Enterprise miner (as a new user, a student) on a huge
dataset. there are few problems I have during the model developement
which are:
A. The computer ( or SAS) become very slow and didn't respond while I
tried to connect dataset from server with 'input data node'.

B. for this problem I have made a sample of 150,000 records with 80
variables and saved it on a hard disk. Now the problem is when I build
the tree then it only shows two 1 node with two leaves ( while responce
has (34,000 (0) and 80,000 (1) and some missing data). I don't
understant how to create tree for this model.

C. With the similar dataset, I also tried to build Neural network and
it doesnot shows any result.

I am wondering, I may be failed to develope such a model. Suggest some
way to get out from this point.

cheer's
Syed

.

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