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Several attempts to use nlite slipstream XP Pro with SP3 and .net Framework 3.5 failed with the error "cannot copy the file clock.avi". After some fussing, this error was replaced by another error "cannot copy the file courdb.ttf". Finally I resolved these errors. Just before the creation of the ISO by nlite (the stage at which one can add files to the working folder to be included on the ISO). I searched my C:\Windows directory for the files that were missing. Both clock.avi and courdb.ttf were in my Windows directory. I copied the files into to the I386 folder within the nlite folder that nlite created with the slipstreamed files. This worked like a charm.