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#21
Please post back a screenshot of your Disk Management - Post a Screen Capture Image
so we can see if anything is obvious.
From there establish a Clean Boot and work through the other Troubleshooting Steps for Windows 7
to go over it thoroughly.
If these fail to resolve it you can determine what's happening during the boot time with certainty by Gathering a Startup, Shutdown, Sleep, Hibernate, or Reboot Trace - Windows 7 Forums