Click Start > Programs > Accessories > System Tools > Disk Cleanup
The options for the files that you can specify for Disk Cleanup
Temporary Setup Files - These are files that were created by a Setup program that is no longer running. These can be deleted safely.
Downloaded Program Files - Downloaded program files are ActiveX controls and Java programs that are downloaded automatically from the Internet when you view certain pages. These can be deleted safely.
Temporary Internet Files - The Temporary Internet Files folder contains Web pages that are stored on your hard disk for quick viewing. These can be deleted safely.
Old Chkdsk Files - When Chkdsk checks a disk for errors, Chkdsk might save lost file fragments as files in the root folder on the disk. These files are unnecessary. These can be deleted safely.
Recycle Bin - The Recycle Bin contains files that you have deleted from the computer. These can be deleted safely.
Temporary Files - Programs sometimes store temporary information in a Temp folder. These can be deleted safely.
Temporary Offline Files - Temporary offline files are local copies of recently used network files. These files are automatically cached so that you can use them after you disconnect from the network. These can be deleted safely.
Offline Files - Offline files are local copies of network files that you specifically want to have available offline so that you can use them after you disconnect from the network. These can be deleted safely.
Compress Old Files - Windows can compress files that you have not used recently. Compressing files saves disk space, but you can still use the files. These can be deleted safely when necessary otherwise leave it.
Catalog Files for the Content Indexer - The Indexing service speeds up and improves file searches by maintaining an index of the files that are on the disk. These Catalog files remain from a previous indexing operation and can be deleted safely.
There is more options tab on the disk clean up dialog box, If you have the knowledge, then you can remove the unused or unimportant windows components or intalled programs.
After cleaning up it is the best time to run Disk defragmentation. That will rearrange the clusters in the gap of hard disk produced by disk cleanup.
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