cannot perform this action on a user mapped file

  a member 15:20 02 Jun 2008

not every time but almost when I download a file right at the end as the file is being loaded I get a window opening stating that (the following action cannot be performed on a user mapped file )
This happens with some downloads , but also occurs when I transfer some files between drives .
I get the option to cancel or try again, if I select try again it allways completes the download or transfer without complaint .so why am I getting the message in the first place .

vista ultimate 64
no UAC (removed during preinstall)
and running as administrator only , (no other users)

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