Hi,
According to the description, the issue seems to be related to Windows 7. As we mainly focus on the Server Core question about Windows Server system and here is not the best support resource for Windows 7, it is recommend you to get further support in the corresponding community so that you can get the most qualified pool of respondents. Thanks for your understanding.
For your convenience, I have list the related link as followed.
Windows 7
http://social.technet.microsoft.com/Forums/en-US/category/w7itpro
Best Regards,
Vincent Hu