Multivariate Regression proble with two many vairbale and SPSS won't run it

#1
High, I have two sets of variables 6 each. SPSS gives me data overflow error. I am not sure how to solve this. I have taken one set of variables and did a PCA which reduced them to two factors. Can I do this? My logic is that the components actually give me good information. Any advice is greatly appreciated.