The Student Edition is only 32-bit enabled. Commercial Pro/ENGINEER is both 64-bit and 32-bit ...we have only released educational editions in 32-bit. With WF 5.0, we will provide both 32 and 64-bit versions of Pro/ENGINEER Education Editions. In the meantime, you should be able to install the Student Edition on your 64-bit OS. Please note: this edition will not utilize the benefits of the 64-bit OS…..extended memory, etc. It will simple be a 32-bit application on your OS. For further assistance please email to - Vali