[perfect stranger]

You need to check to see if Windows is even noticing the second partition on the drive. Perhaps Windows did not assign a drive letter to the second partition and you would not see it show up in the Explorer shell (in "My Computer").

If Windows was noticing the second partition this thread wouldn't be here.

Return the hardware back to its original configuration.

If that worked I wouldn't be asking.

[rabscuttle385]

If Windows was noticing the second partition this thread wouldn't be here.

And by "noticing" the second partition, is it even visible from the disk management tools (diskmgmt.msc)? If it's not, then this isn't an issue of just reassigning a drive letter but basically a drive that needs actual data recovery.