Some very interesting info:
https://msdn.microsoft.com/en-us/library/windows/desktop/bb891959#mindiffareafilesize
Here are some steps and info:
http://www.storagecraft.com/support/kb/article/32
Here is a Fix-It from Microsoft for Server 2003, which runs quite a few steps automatically, and does not (this is new) necessarily require a reboot:
http://support.microsoft.com/kb/940184
And lastly, here is a patch from Microsoft which can help a lot in Server 2003, even on fully-updated machines:
http://support.microsoft.com/default.aspx?scid=kb;en-us;891957