I'm unable to find anything specific on "error 43" but various other posts seem to indicate a fresh install and partitioning are your best options.
Searching for "Computer Management + error 43" gets a M$ page with...
Windows has stopped this device because it has reported problems. (Code 43) One of the drivers controlling the device notified the operating system that the device failed in some manner. For more information about how to diagnose the problem, see the hardware documentation.
On the General Properties tab of the device, click Troubleshoot to start the troubleshooting wizard.