Assembly Cache Viewer – Install Failed

Hello to all experts here at TechyV!
I’m having trouble installing .NET assembly into GAC on a Windows 7 desktop.
I just use to drag files into the GAC and never had trouble like this. Does this have something to do with Windows 7?
Please share thoughts and suggested solutions to this error.
Thanks a lot guys!

Assembly Cache Viewer – Install failed
Access is denied: ‘blbmmc.resources.dll’.
OK
