If windows failed before the removal of source data, you shouldn't loose anything. Windows does not crc check transfers so if the data wrote to disk and windows removed file from source and your destination data is corrupted you have effectively lost your data. Unless you of course use some data recovery software. Windows never removes source data if the transmission is broken/stopped/halted..
Personally I use 3rd party software to copy/move data on my systems as windows lacks features! CRC check source (on copy) and an additional read CRC check on destination after write. This process has saved me in the past and worth the extra time required (additional as in it needs to read destination data). More modern filesystems have checksums built in, one of these days this should all be built into OS operations based on filesystem figures over software ontop of operating systems.
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