Frequent Windows maintenance is very important to keep our computer running in tip top shape. One of the first thing you should do in Windows maintenance is removing temporary junk files. Most of your Windows applications create temp files on your hard disk when they are running. These files are supposed to be removed but not all programs do it automatically. The temp files may have been accumulated to megabytes since you have begun using your PC, and they can waste large amounts of your hard drive space without you knowing it! This will lead to the reducing of free space on your hard disk, fragmentation and reduction of the system performance.
Even when a computer is being infected by virus of spyware, the first thing you should do before running a scan is to delete all temp files. Without a doubt that CCleaner is one of the best free program to clean up junks and it supports cleaning many third party applications temp files.
Here’s another great temporary file cleaner which is very small in size (49.5 KB) and widely recommended by malware cleaners.
ATF (A Temporary File) Cleaner is a free temporary file cleaner for Windows Windows 98/ME/2K/XP and Vista, Internet Explorer, Firefox and Opera with a simple, easy-to-use interface. This tool is commonly recommended by malware cleaners in forum to clean the temporary files in your computer before running a scan with HijackThis.

The main screen allows the user to either clean all temporary files, or select files for cleaning. The program also knows if Firefox and or Opera is being used, and gives the option of cleaning the temporary files associated with those applications. ATF Cleaner provides the user with a window showing the total bytes freed upon completion. The program is small (49.5 KB), quick to run and no installation required.
Note for Vista users: On Windows Vista that “Windows Temp” is disabled, to empty “Windows Temp” ATF-Cleaner must be “Run as an Administrator”.