When you open Windows XP's My Computer System Folder you will usually see a set of folders at the top of the page under the group called Other Files Stored on This Computer. Even on a home PC shared among family members, I haven't found this useful. Certainly not on a work PC. To eliminate the Other Files Stored on This Computer folders you can use the following registry hack:

Hive: HKEY_LOCAL_MACHINE
Key: Software\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\DelegateFolders

DelegateFolders has a subkey : {59031a47-3f72-44a7-89c5-5595fe6b30ee}. Once you delete this subkey, all of the Shared Documents folders displayed on My Computer will be gone. Effect of hack is immediate. No reboot needed in XP.