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#11
The Disk Mgmt error is common in cases where Partition Magic - which is not Win7 compatible - is used and ruins Win7.
The solution which most commonly works as described in Disk Management Console view is not up-to-date. - Microsoft Community is uninstalling the HD and/or its driver in Device Manager, rebooting to reinstall it.
If that fails google the text of the Disk Mgmt error and work through all of the solutions suggested. If you're concerned about any just ask back here and keep us posted on your progress.