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Try using Universal Naming Convention (UNC) protocol to access your shared folder. Let's call the computer with the shared folder the server and the other the workstation. On the workstation, right click the start button and left click Explore. In the address field at the top of the Explorer window, type \\NameOfServerComputer\NameOfSharedFolder substituting the actual names. You can find the name of a machine by right clicking My Computer and left clicking Properties. Then left click the Computer Name tab. The Full Computer Name is listed there. The name of the Shared Folder is the name that appeared in the field below the Share this folder button when you clicked it. You can right click the shared folder icon and left click Sharing to see it again. Windows is notoriously poor at advertising shared resources in My Network Places. Using UNC can be much easier.
Our school district has had many of these. While I have been unable to find word one about it on Microsoft's site, I did find this article: http://www.kb.ucla.edu/articles/svchostexe...plication-error This article includes a longer version of the fix which almost always works (the short, easy fix above is not always succesful). I've only had to reformat and reinstall one stubborn machine so far.