Temporary Internet Files: Temporary Internet Files are, in fact, the cache of the browser. This means that when you load a web page with your browser, it is saved on your computer so that if you later decide to open the same page again, it will open a lot faster. Support Internet Explorer, Netscape, AOL, Mozilla Firefox.
Cookies: Cookies are messages that web servers pass to your web browser when you visit Internet sites. Your browser stores each message in a small file, called cookie.txt. When you request another page from the server, your browser sends the cookie back to the server. These files typically contain information about your visit to the web page, as well as any information you've volunteered, such as your name and interests.
Visited URL History: Browser saves web pages, images from visited web sites into your hard drive whether you click on them or not, so that next time when you visit you won't have to re-download the image. But this means that many megabytes of data of all types get saved to you hard drive. Anyone who can use your PC can tell where you have been browsing on the web.
Recently Typed URLs: Any website addresses you manually type into the address bar are stored and displayed in the address drop-down box. Selecting this option will safely remove the record of typed in addresses.
Index.dat files: Index.dat are files hidden on your computer that contain all of the Web sites that you have ever visited. Every URL, and every Web page is listed there. Not only that but all of the email that has been sent or received through Outlook or Outlook Express is also being logged. The file names and locations depend on what version of Internet Explorer you have. If you are running IE version 4.0 or above, the file name is "index.dat". Microsoft has not supplied an adequate explanation as to what these files are for or why they have been hidden so well.
Last Download location: Files and file components that you have downloaded from the web are stored in directories on your computer. Examples are Active X and Java Applets. Sometimes these files are harmless, sometimes they can contain virus, spy ware, or ad ware applications.
Autocomplete History: Browser can store a record of almost everything that you typed into any web site form. Form data can be things such as all the keywords you have ever typed into a search engine and personal information such as your name and address.
Recently Documents: Recent Documents lists the last 15 document files that you have accessed, allowing any of these documents to be reopened simply by clicking on the name of the document.
Start Run: Windows stores the programs you ran in the start menu run text box. so that you do not need to type if you want to run it again, but it will also let others have the choice to see what program you have run.
Search Assistant: Windows saves the files, text and computers you have ever searched, so when you want to search again, you do not need to type again, but others can also find what you have searched on your computer.
Temporary Files: While working, many computer programs and also Windows itself create a lot of temporary files. These files are not harmful in themselves, but they tend to accumulate and take up a lot of disk space. Also, when your disk space is low, Windows will work slower than usual.
Clipboard: After you finish using programs or performing copy/paste operations in Windows, all kinds of data can be left behind in the system's memory. Other programs and other users can obtain this data.
Memory Dumps: The *.dmp files created by windows when there is a system crash.
Chkdsk File Fragments: The Windows utility Scan Disk creates .CHK files at the root directory of drives. These files usually contain junk data and can be erased to help keep drives clean.
Windows Log Files: When you install a new program or piece of hardware Windows logs the changes to .LOG files in the Windows directory. In most cases these files will never be needed, even for advanced users. This option will safely delete these files.
Open File History: Windows records the filenames that you opened and saved in the system registry.
Menu Order Cache: The Start menu allows you to set a custom order to the programs listed, although there's no option to sort all folders by name. Selecting this option removes any custom ordering from the Start menu.
Tray Notifications Cache: In Windows XP the System Tray (the set of icons next to the clock in the bottom-right corner) orders and hides items automatically for you. Whilst this is useful, it records a list of every program that has been run from the tray. This option clears the list of previous programs and removes any custom display/hide options. (Warning: This won't have any affect until you manually restart the explorer process from the Task Manager.)
User Assist History: The start menu on Windows XP displays a list of the most recently run programs. Selecting this option will clear this list.
Applications: This displays a list of additional cleaning settings for third-party applications you have installed. This list will change automatically to include new programs.

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