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Boot free Partition Wizard bootable CD, rightclick on D to Explore for files.
If there is no partition remaining or files are missing from within one, run the Partition Recovery Wizard from the Wizards tab on the HD. It will scan and find any missing partitions which have not been secure erased. You can then select the correct missing partition and it will reinstate it if possible.
If this fails which is rare next run Recuva data recovery: Recuva - Features
There is no way the missing partition could be caused by running Startup Repair, but it could be caused by infection which may still exist on HD. For this reason, I would first install, update and run a full scan using Malwarebytes, in Safe Mode if necessary.
If for some reason it doesn't run download and burn to CD or write to flash stick Microsoft Standalone System Sweeper, boot it, allow it to update via wired connection then scan the HD.
If infection isn't responsible, then you can continue troubleshooting your BSOD where you left off. Set a Restore Point recoverable via DVD/Repair console before each step.