>>If your client doesn''t have the time, money, wherewithal, etc. to support a dedicated NT/Win2k server, I might recommend one of these. Very easy to install and maintain, and quite reasonable.
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>My client has a Compaq Pentium IV and has Win XP Home Edition on it. Could just the move from Win XP Home to WinXP Pro do the job?

Who knows? Will this machine still be used as a workstation? If so, then any shared resources are still at the mercy of the current operator. Please look closely at the link I provided. At $549 for 40 GB of storage, less than 1 hour setup for a complete rookie, you could have solved the problem already. I doubt you could upgrade this machine for this, unless you work for free. Reliability will always be an issue with your setup.