We have 50 PCs connected to one domain server
We also provide users a network drive to save their documents
We need that users cannot add or delete or modify documents on other drives and on my documents and dekstop.
The access to drives is restricted easily but access to my documents and dekstop is not managed by me.
Please assist me how to restrict my documents and dekstop.

Regards
Sherry

There are many ways to encrypt files. One I have found is Advanced File Lock (http://www.download.com/Advanced-File-Lock/3000-2092_4-10660635.html). I have not tested it, but according to its definition it is what the Government uses, and has a 4.5 star rating.