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  A computer user may choose from several operating systems today, including Microsoft Windows XP. While using most modern computer operating systems, it can be useful to occasionally clean files and data no longer necessary for the optimal functionality and performance of the computer. It's also true of the Windows XP operating system, so removing leftover files, problematic software, and registry entries can help to improve the efficiency of Windows XP. You can do this through a variety of cleaning tools.
  
  

nCleaner

• The software utility known as nCleaner is a multi-tool for cleaning the Windows XP operating system. nCleaner is a freeware product for non-commercial use made by Romania-based NKProds. The nCleaner application has a plethora of cleaning options available for use. It's relatively easy to use, as it states what changes you can safely perform and what changes may be risky. The nCleaner software is clear about the specifics of what changes it may perform on a Windows XP operating system. This can be a helpful feature for a careful computer user.
  
  

AVG Free

• One of the primary reasons a computer user will have to clean his Windows XP operating system is that he may have installed malicious software unintentionally. One of the most popular freeware software tools available for removal of such software is AVG Free. AVG Free is primarily used to clean and remove software viruses and their associated files. It is also useful for daily protection of a computer. Prevention is a good practice for maintaining a clean and efficient computer.
  
  

Spybot

• Spybot, freeware supported by user donations, cleans and removes spyware. A spyware application basically monitors a computer user's activity and sends the collected data to another computer. Spybot is used to remove such software and also to protect from any unintentional installation of spyware applications. Spybot is also useful for cleaning and removing adware, which places unwanted advertising in windows of software applications.