Win7 64 bit clean install error. unable to create system partition.

Hi,
I had 32 bit win7 home premium provided by OEM. Recently I purchased win7 professional 64 bit in order to increase my memory.(My system is 64 bit capable) I followed [1]. I am using USB for installation. I booted the system with USB. Then at disk manager I deleted all the partitions(including recovery ) Then I refreshed and click next and I got an error saying setup unable to create system partition. I also tried diskpart clean. Still no hope. So I am stuck with a formated laptop. Want to get this working soon. Can anyone of you kindly enlighten me on this issue.





[1]https://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html

its an original copy downloaded from Microsoft. But the setup was there for about 4 months in my HDD. Can this happen if the setup is corrupted?

I am an engineering undergraduate. So university offered us with windows 7 professional.

Ok. I'll check with them. Thanks for the support. Is there any chance that this is happening coz of a fault in my HDD? fault in MBR or something.

I followed various forums, tried various methods. but nothing is working for me. wasted more than 5-6 hours. Now I'll first check if win7 setup is ok.