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I am trying to create a back-up system right now wherein the user can enter the drive letter and the back-up directory name. how can i possibly determine if the drive is valid or present? or is there another good solution in creating a directory?
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You can use the File System Object.

Check out:
http://fox.wikis.com/wc.dll?Wiki~WindowsScriptingHost

And the excellent series of articles on WSH by Geporge Tasker and Ed Rauh in VFUG:
http;//www.vfug.org (free membership) starting with the September 2000 newsletter.