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#50
Hello expoke, and welcome to Seven Forums.
The issue is that changing the drive letter B: to S: broke all shortcuts and registry entries pointing to B:.
Unfortunately, as you found out, the A and B drive letters cannot be added to the index.
Index Locations - Add or Remove
About all you can do is to properly move everything back to C, change the drive letter from B: to S:, move everything back, and fix any broke shortcuts to point to the correct S: target.
Hope this helps, :)
Shawn