Copying large numbers of files can be a less than pleasurable experience sometimes,
even with the file-copy improvements made to Vista. As for Windows XP, it aborts file operations just for a single corrupted file! TeraCopy enhances it a lot, and for free.

You can move thousands of files at once without freezing your PC, copy
files faster, retry failed file transfers repeatedly, and even pause and resume them if you have to do something more urgent right then. Please note that UAC needs to be turned off, for TeraCopy to function well on Vista.