How to get VIF:
In SPSS Regression dialogue box: Select statistics button;

     Check collinearity diagnostics in window.
Example: Download the following file: collinearity.sav.
Let us assume that the variable "RELIGIO2" is another measurement of religiosity beside the one that was already there "RELIGIOU." When one puts both of them together in the same model, none of them is statistically significant. The VIF is above 5 which means that multicollinearity inflated the standard errors which lowers the T test below 2 which means that the significance level becomes above .05.