The newer version of NTFS introduces some new "features" One of these is a file indexing thing that enables you to search for files and also text within files very quickly. How is this done? Well... every time you add a file it is logged into a DB that can eat away at your drive space rather quickly and slows you down while doing so. I would suggest everybody turn this off because I don't know of anybody who does enough searches on their drives to sacrifice as many resources as this does.

2. Right click your hard drive icon and select properties.
3. At the bottom of this window you'll see "Allow indexing service to index this disk for faster searches," turn this feature off for all of your drives by unchecking the box and clicking ok..
4. After that a window will appear and you'll want to choose apply to all folders and subfolders if you want the full benefit. You could turn this on for selective folders that you search frequently. For the most part you want this off for all of your folders.