Switching from my old laptop (Windows XP) to me new one (Windows 7) involved a lot of copying/etc. These free and (some) open source file utilities really made life easier for me. Definitely recommended.
WinDirStat (OpenSource)... http://windirstat.info/
FileMenuTool (Free)... http://www.lopesoft.com/en/fmtools/info.html
CSDiff (Free; also have CS-HTMLDiff and CS-ExcelDiff utilities... http://www.componentsoftware.com/Products/CSDiff/
WinMerge (OpenSource)... http://winmerge.org/