Say “No to all” when asked if you want to replace files
This used to do my head in until I found this little tip on Lifehacker.
Picture this: You’re consolidating your digital music collection from numerous locations to a single directory on a networked drive. To save time, you don’t want to replace existing files as these are most likely duplicates, and network transfers are often slow. Unfortunately, when Windows pops up and asks you whether you want to replace the existing file, it gives you every option you’d like apart from the most useful: “No to all”.
To tell Windows “No to all”, hold down Shift while clicking No, and it will apply to all replacements for that transaction 
This will also work when Windows asks whether you want to move Read-only Files or not.
zach lailer said,
14 February, 2008 at 3:49 am
Thanks! I never knew that man! That will surely come in handy from time to time.
Donn said,
17 February, 2008 at 3:05 pm
Aye, that’s a nice wee tip there and a new one on me. If only I had know that in the past it could have sped things up, oh well…I’ll certainly remember it for future reference.