IF YOUR SYSTEM BECOME SLOW ,then use this TRICK for getting FAST

STEP 1: Right click on DESKTOP

STEP 2: Open NEW Shortcut

STEP 3:type   
 %windir%\system32\rundll32.exe advapi32.dll   

on that Shortcut

STEP4: type the name  for this short cut is  'clear memory'

STEP 5:  click FINISH.

after  this just  click on that short cut.. it  will improve your system speed..