Windows Explorer caches DLLs (Dynamic-Link Libraries) in memory for a period of time after the application using them has been closed. This can be an inefficient use of memory.
Just follow the following steps:
Go to start then run then type "regedit" and press enter, then

1. Find the key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer].
2. Create a new DWORD sub-key named 'AlwaysUnloadDLL' and set the default value to equal '1' to disable Windows caching the DLL in memory.
3. Restart Windows for the change to take effect.Please keep in mind, that editing a registry can be dangerous if not properly implememted. So always save a backup of the registry before applying any registry tweaks.This site is not responsible for any malfunctioning of your system.