Dear Mahmoud, there are several available options for estimating item bias (or more adequately termed, Differential Item Functioning) using SPSS if the items are dichotomous. Two of the most well known non IRT methods are available using the Mantel Haenszel Statistic in crosstabs (you'll need to cross item response by group by total test score, but it will yield only uniform DIF results). Alternatively you may use Logistic regression methods using item response as dependent variable, and group, total score and Total score by group interacion for detecting non-uniform DIF. You'll need to interpret significance and pseudo-R2 values.

If items are ordinal, you cannot use the Mantel Haenszel test "as is", but you may still use Ordinal Logistic regression for detecting DIF in this case.