Maggie's Farm

We'll use DOS for the first two, so go to the Start Menu, Programs, Accessories, right-click on 'Command Prompt' and 'Run as administrator'.  A black DOS box will pop open.

1.  When Windows 7 installs its big 'Service Pack' as part of the Windows Updates, it backs up a whole shitload of files so it has something to fall back on if the update doesn't work.  Unfortunately, it forgets to delete them after it does work, so this will clean things up.

Highlight the following, hit Ctrl-C to copy it to memory, then right-click in the DOS box and 'Paste'.  Hit the Enter key and kick back.  Once it gets to 100%, it'll take a fair while to go through things.  Your hard drive light should be blinking like mad the whole time.

     c:\windows\system32\dism /online /cleanup-image /spsuperseded

2.  The 'Hibernation' routine is kind of goofy and rarely used, and while you can turn it off through Windows, it doesn't get rid of the huge file on the root of the C Drive.

Paste or type this into the DOS box and hit the Enter key:

     powercfg -h off

That turns it off and gets rid of the mega-file.  Close the DOS box.

3.  The 'pagefile' is a large file on the root of the C Drive, usually somewhere between 2 and 4 gigs in size.  It's a valuable file, but since Windows lets us put it on any partition we like, we'll take advantage of that.  If you have a second hard drive, put it there, otherwise any partition besides the C Drive will work fine.

— Open Control Panel, System, 'Advanced system settings'.

— Click on the first 'Settings' button, then the 'Advanced' tab, then the 'Change' button.

— Click the drive you want the pagefile on, then down below click the 'System managed size' gadget, then 'Set'.

— Click on the C Drive (which should have 'System managed' by it), select 'No paging file' down below and 'Set'.  The system will want a reboot.

Note that the pagefile is a 'hidden' file and you won't be able to see it (to verify it's now on the other drive) unless your system is set to view hidden files.  To do so, go to Control Panel, 'Folder Options', the 'View' tab, select 'Show hidden files'.  You might also want to uncheck 'Hide extensions...' while you're there, just so you can see the complete file names.

4.  The 'Temp' folder is where things like Setup programs temporarily stash their install files, and many don't clean up after themselves.  It can grow to immense size over time.

A handy program that cleans out the Temp folder (among many other things) is the popular CCleaner.  Install the rascal, run it.  On the main panel, if you use Internet Explorer, uncheck everything but 'Temporary Internet Files'.  If you use Firefox (or any other browser), click on the 'Applications' tab and do the same thing.  Keeping specific cookies (so you don't have to re-log on to certain sites) but deleting the rest takes a bit of effort, but can be done.  Details are here.

Click on 'Options', 'Settings'.  All boxes at the top should be unchecked except 'Automatically check...'.

To run the main program, click 'Run Cleaner'.  If a browser or email program is open, it'll ask you to close it.  That takes care of the possibly-humongous 'Temp' folder and a bunch of lesser clutter.

To give the Registry a clean, click 'Registry', then 'Scan for Issues', then 'Fix selected issues'.  This really doesn't make any practical difference, but it feels good.

5.  Lastly, we'll give the whole C Drive a scan with TreeSize, which sorts the drive by file size, then we'll examine the biggest brutes to make sure they're on the level.

Install, fire it up.  Click on 'Options' and uncheck 'Show Long Tooltips'.  Click on the little folder icon, select the C Drive and let 'er rip.

The 'Windows' folder will most likely be at the top of the list, and probably anything inside of it is legitimate.  What we're looking for are large temp files that some program was in the middle of creating when suddenly the system melted down or the program barfed and didn't get the chance to delete it.

These will usually be in one of three places; the folder the program was installed in, one of the ten thousand miscellaneous folders in the 'Users' folder, and the 'Temp' folder, which we've already taken care of.

Second on the list will probably be 'Program Files'.  Click on the little + next to the name to expand it.  Top of the list will probably be 'Common Files', followed by a bunch of program folders.  If any of the program folders look 'suspicious', like over 200 megs, examine it and see if there's one big file that seems out of place.  If it's got a legitimate file extension, like ".dll" or ".exe", that's okay.  You're looking for any file that either doesn't have a file extension, or might actually have a ".temp" extension.

Then do the same thing with the 'Users' folder.  Start opening the larger folders, figuring out why they're so big.  If it ends up that it's nothing more than a whole shitload of files, that's normal.  Again, what you're looking for is a single file (or two) that are much larger than anything else in the folder.

In my experience, I can think of two programs that have left mega-sized files behind, Nero (disc tool) and SoundForge (audio editor).  Nero had barfed at the end of making a 4-gig DVD image file and there the puppy sat, wasting some serious drive space.  SoundForge did something similar with a couple of 2-gig full-movie audio files.  As I recall, the Nero file was in 'Users' and the SoundForge files were in the SoundForge program folder.

Another helpful program when it comes to "figuring out where the big stuff is" is a program called DiskPie.  The latest version is now commercialware but the original free version is here.  It'll show you where everything is in pie graph form.

Commenter KF also recommended WinDirStat, which looks pretty slick.

Any questions, additions or corrections, give a holler in the comments like usual.