1. how about posting this in the S.T.A.L.K.E.R. problems, errors, and help section idk why but i have a feeling you might get better help there, than in the clear sky discussion thread. :D
2. do you meet the minimum system specifications??
3.what do you mean by it wont run?? do you mean it wont start up when you click the launch icon? or do you get crashes or bug trap errors?