I have found that with some installers (older ones mostly) that the real problem is too much free disk space (over 2 gig). If it fails a manual install, temporarily increase the size of the page file to reduce the amount of free space. If that does it, find yourself a stick and go beat on someone with it. [Big Grin]
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.