There are many tools to delete the unknown file from your computer. Unknown file is the file that appear without your aware. One of the tool or software that can be used to delete those files is Ccleaner (2,851 kb). This freeware can be downloaded from: http://www.ccleaner.com/download

The task that can be done by this software such as clean:

Internet Explorer
Temporary Internet Files, Cookies, History, Recently Typed URLs, Delete Index.dat files, Last Download Location and Autocomplete Form History.

Windows Explorer
Recent Documents, Run (in Start Menu), Search Autocomplete, Other Explorer MRUs and Thumbnail Cache.

System
Empty Recycle Bin, Temporary Files, Clipboard, Memory Dumps, Chkdsk File Fragments, Windows Log Files, Start Menu Shortcuts and Desktop Shortcuts.

Advanced
Old Prefetch data, Menu Order Cache, Tray Notifications Cache, Window Size/Location Cache, User Assist History, IIS Log Files, Hotfix Uninstallers and Custom Files and Folders.

Firefox/Mozilla
Cookies, Download History, Internet Cache, Internet History and Saved Form Information.

Applications
Adobe Photoshop CS, Adobe Reader 8.0, MS Office Picture Manager, Office 2007 and Office 97.

Internet
Sun Java and Yahoo Toolbar.

Multimedia
Adobe Flash Player, Real Player and Windows Media Player.

Utilities
IZArc, WinRAR, WinZip and Windows Defender.

Windows
MS Paint, MS Wordpad and RegEdit.

Beside to clear the task that has specified above, Ccleaner also has the other function such as Registry Checker, uninstall software from your computer and manage your computer startup.

Registry Integrity
Missing Shared DLLs, Unused File Extensions, ActiveX and Class Issues, Application, Fonts, Application Paths, Help Files, Installer, Obsolete Software, Run At Startup, Start Menu Ordering and MUI Cache.

We do not realize that sometimes the file that we have opened or the website we have visited leave file. The file that leaved by them is small size but if we never delete them in a long time that file can spend many resources.

One of freeware that very useful to delete that unwanted file is FREE INTERNET WINDOWS WASHER that you can download freely from http://www.eusing.com/Download/FIWWSetup.exe (888.15 kb).

The utility of this software such as erase Internet Explorer Cache Files, erase Internet Explorer Browser History, erase Internet Explorer Cookies, erase Internet Explorer Typed URLs History, erase Internet Explorer Index.dat Files, erase Internet Explorer AutoComplete Memory, erase Windows Recent Documents History, erase Windows Start Menu Run/Find History, erase Windows Recycle Bin, erase Windows Temporary Files Directory, erase Windows open/save history, erase Windows MediaPlayer/Real Player history, erase Microsoft Office history, erase Mozilla Firefox Cache (Temporary Internet Files), erase Mozilla Firefox Cookies, erase Mozilla Firefox Visited URL History, erase Mozilla Firefox Download Manager History, erase Mozilla Firefox Autocomplete History, erase Mozilla Firefox Preferences, erase Mozilla Firefox Saved Form Information, Erase Opera Cookies, Erase Opera Visited URL History, Erase Opera Recently Typed URLs, Erase Opera Autocomplete History, Erase Opera Transfers, erase Netscape Cache (Temporary Internet Files), erase Netscape Cookies, erase Netscape Visited URL History, erase Netscape Preferences, erase Netscape Saved Form Information.

Note:
When you start to use this software, the software will ask you to Enter registration code, so you just need to click Skip button.
For the first time using, you have to click Wash Settings to select thing that you want to wash. Right click to popup menu to select all or none.
To start washing, click menu Wash Now.