1. Right click on an empty spot on your desktop and select New - Shortcut.
2. Type %windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks in the box.
3. Click Next.
4. Give your shortcut a nice name like "Clean Memory"
5. Click Finish and you're done.
Now whenever your computer starts running slow click this shortcut to flush everything out of memory