"I can reboot from my backup drive but now this can't even see what was my C drive"
Is your backup drive an internal HDD? Is it a clone of your original C: ? if so then that 'backup' will have had its drive letter re-assigned to be the C: drive that pc boots up from.
Please list your previous set up, with details of drive letters and partitions on each HDD
Now list what you have done with the partitoning and what you altered each to
And list what is connected now and what you see in W7 Disk Management. ClickHere for How to
Drive (0) is your main HDD and should contain C: and any partitions on that drive.
Drive (1) is your next HDD........ etc etc.
And finally list the arrangement you want to achieve as your end result.
Do not alter anything yet.