http://www.tweakxp.com/article139433.aspx

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.

1. Find the key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Explorer].
2. Create a new 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.

Sorry to bump this up but I've seen this tweak on alot of tweak sites. I'm sure I've also read (somewhere on a ms page) that this key is not supported in xp, prior to 2000 fine but after it doesnt work. - I maybe wrong, I'll have a look.

Cant find the page at the moment but is this applicable? :
http://msdn.microsoft.com/library/de.../debugging.asp