Clear Memory Cache in Windows XP & Vista to Speed Up Your Computer

Running multiple applications simultaneously in Windows Vista for long periods leads to a gradual decrease in system performance over time.Often the only option to this is a Windows Vista Reboot. Even if you close the application in the Windows Task Manager, the tasks/threads associated with the application are not released completely, depleting the system’s memory resources making the system unstable and sluggish.
Follow the below steps to create shortcut for clearing memory on your Windows Vista Desktop.
•    Right-click on your desktop and Select New > Shortcut
•    In type the location of the item path: Enter below information
%windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks
•    Click Next. In the next screen, Type a name for this shortcut: Ex: Clear Memory or Process Idle Tasks
•    Click on Finish
Your Clear Memory or Process Idle Tasks shortcut is now created and whenever you feel that your Windows Vista computer is busy not responding to commands, just run this command and it should free up the system.Also note that this tweak works fine in Windows XP also.