After performing upgrade on Windows 7 I am not able to use Device Manager. It is not working. When I right click on My Computer > Manage nothing happens. Windows ring just keeps on rotating and there is nothing on the screen. What can be the issue. I had upgraded to Windows 8 last month. There was Windows 7 before. Just today I came to know that Device Manager is not working. I am trying to install a usb sound card.
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