Over time a large number of temporary and unnecessary files can accumulate on your disk, which take up space and reduce the performance of your computer. You could attempt to clean these up by hand, but there's a much better way of doing this – the Disk Cleanup utility.
Disk Cleanup is accessible from the Start menu -> All Programs -> Accessories -> System Tools -> Disk Cleanup. When you first start it you'll see a window like the one below, which asks you which drive you want to cleanup.
After this, the amount of space that can be freed up is calculated, and the results are displayed.
For each category, the amount of space that can be free is displayed. You can check or uncheck the boxes next to each category to indicate which ones should be removed. If you're unsure about any category, you can select it, and then click on the "View Files" button to see the specific files that are affected.
When you've selected the desired categories, click on the "OK" button to proceed with the cleanup.
If you select the "More Options" tab, you can see additional steps you can take to free up space. The first two are to delete Windows components and programs which are no longer required. You should be careful with these, and not remove anything unless you're absolutely sure it's not required. Even if it's a name you don't recognize, and you may not use it directly, it may be required for another program to run.
The last option in this window is to remove all but the last system restore point (if you're not sure what a system restore point is, you should read the How to Use System Restore section). You should only do this if you're sure your computer is running smoothly, and you won't want to revert back to an earlier restore point.
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