Z:\ is not accessible

My private mapped drive was working fine but when I was transfering files to the NAS my network drive disconnected and when I try and reconnect I get the following error:

The specified server cannot perform the requested operation.

Public shares work fine.

Try using WDlink to map the my book.

http://wdc.custhelp.com/app/answers/detail/a_id/8573/session/L3RpbWUvMTM0NTE0Mjk0Ni9zaWQvQU1ERjFTM2w%3D

I’ve tried that but it cannot find my drive but i can access the dash and public shares.

Also in device manager it shows that it needs drivers for the mbld but when searching the cd windows does not find them.