As you are using Win 2003 please check with the DEP option.
Step:
1)Right Click My Computer>> Go to Properties.
2)Click on Advance Tab.
3)Click on Setting button in Performance pane.
4)Click onData Execution Prevention(DEP).
5)Select the second radio button.
6)In the white box crw32.exe should be present if not add it by clicking on Add button and then browse for crw32.exe.