Windows 7 comes with a built-in defragger that runs automatically at scheduled intervals.
While this is less of a problem with today's huge hard drives and copious amounts of RAM, a slow system can still benefit from defragmenting the disk. Defragging tidies everything up and groups a program's bits together so that the reader heads don't have to shuttle back and forth to read a whole executable or data file. Your disk stores data in chunks wherever there's space on disk, regardless of whether the space is contiguous for one file. From this properties dialog, you can choose a Startup type of Manual or Disabled to have the process silent by default. Find Windows Search, and double click on that. Then double click Services and Applications, then Services. Right click on Computer either in the Start menu or on the desktop, and choose Manage. If you want to leave search indexing on, but find that it occasionally slows you down, you can stop its process when you need extra speed. To turn off indexing, open the Indexing Options Control Panel window (if you just type "index" in the Start button search box, you'll see that choice at the top of the start menu), click "Modify" and remove locations being indexed and file types, too. You can get a little boost with this move, but of course if you do a lot of searching, this won't appeal to you, as some searches will be slower. If you want to get more granular, run Microsoft's Autoruns utility. You may have to check the program names online with a site like to see what they are – they may even be malware. Don't delete those that support your hardware or security, but anything blatantly non-productive can go. There's absolutely no need to have QuickTime running all the time, for example.
You'll likely see a slew of apps, mostly for system support, but you'll be able to identify some that clearly aren't necessary. In the Start button's search box, type MSCONFIG, then head to the Startup tab.
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