Clean up the system today

• Login as each user and perform the following steps for each user

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  Delete unnecessary files that are not needed any more, from the desktop,
  Mydocuments, and other folders.

  
  
  
  

  Remove cached files from Internet Explorer or Mozilla Firefox, which ever your browser is.

  
  
  
  

  Remove files from temporary folders

  
  
  
  

  Run the Disk Cleanup by clicking Start --> All Programs --> Accessories --> System Tools --> Disk Cleanup.

  
  
  

• Login as Admin or with an account that has administrator privileges if you have not already logged in so.
• Uninstall unnecessary programs those you do not need/use any more (make sure you have the install program some where with product code, in case if you wan to install again in future. Good example is I have Microsoft Flight Simulator installed 6 moths back which you is not use now as I am not interested to play. Before you uninstall it, make sure you have the original software and it's product keys available in case if your nephew want to play during his vacation.)
• Many of the above tasks can be done with the simple program CCleaner. Install it and run it in every user profile. It has File cleaner, Applications Cache Cleaner, Uninstall applications feature, Startup programs cleaner (use it cautiously, you can not undo it, you have to manually add the registry entries if you have to undo, better note down if you delete any entries , never delete antivirus program entries for example), Fixing registry entries and many more. Definitely go through the Quick Tour to get an idea before you download. Caution: Some of the options that you select willl remove the cached Internet User names and Passwords.
• Once you done the cleaning, Defrag the drives

How the temporary files are created and How can we delete these Files and makes pc faster

Every operating system and program that is installed on a computer creates temporary files for its working. These files are usually automatically deleted by the program, but often these files are still present on the system, causing a huge clutter of unwanted files. Finally, these files cause a hard drive to get heavily fragmented, which in turn slows down the computer. It is difficult for a user to find and deletes these files as they are never in one single location. They are usually scattered in temp and cache folders of each program. You can make use of disk cleaning software such as Windows Washer, CCleaner or Disk Scrub, which can help find and safely delete these files for you. You should use one of these utilities regularly (at least once a week) if you are using your computer every day. Once you clean out the temporary files, you should also run the disk defragmenting utility to defragment your hard drive and increase the performance of the system.

Cleaning the system by deleting junk, cache, and cookies can increase the overall performance.