Windows 7 Overwrite or Replace folders and files, instead of creating - Copy versions

[getntune]

I frequently bring home files from work on a thumb drive to update my home PC. On WinXP and Vista I could simply drag and drop those folders and files into the same directory on my home PC and select to replace the old version. That option does not appear consistently in Win 7. Typically it creates a copy of the file and/or the entire folder, eg, Folder - Copy, or File - Copy. I now have an incredible mess of older and newer versions of folders and files with - Copy appended to their names. How do I turn this off such that either the file is always overwritten, or I am prompted to Replace the folders and files?

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