OK, by your reply "majority of clients run with W2k" I assume then no Win9x/ME/NT4 so deep mapping and Z: are not the issue.
You then need to do some testing to see what is and is not working. Thry running in debug mode and single step through the script to see. You can also salt in some @Error and @SError lines to see what is happening. The FAQ section has some good tips on troubleshooting.
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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.
