Civil 3D 2011 on W7 x64 is much faster compared to prior versions and Oss.
Can you please try opening one of the tutorial files (ie C:\Program Files\Autodesk\AutoCAD Civil 3D 2011\Help\Civil Tutorials\Drawings\Corridor-1a.dwg).
This drawing should take around 12 sec. to open in W7 x64 bit machine with 8 GB of RAM.
If it takes much longer to you to open, you should consider verifying the RAM, the graphic card drivers, or other potential conflict in your system.
Regards
Antonio Barroca
Autodesk Product Support
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Antonio Barroca
Product Support Specialist
Autodesk, Inc.