Not being in an Active directory domain limits your options. What you could
test is to make the users power users, add them to the network operators
group if you need them to manage network connections, and then use Software
Restriction Policies to manage what software they can install [if any] and
run. Power users can do more than regular users such as create shares,
create non privileged user accounts, and write/delete to most
folders/registry keys in the operating system but still not do things like
manage Local Security Policy and local Group Policy via gpedit.msc. The link
below explains how to configure Software Restriction Policies using mostly
path and hash rules with a default security level of unrestricted or
disallowed. When configuring SRP keep in mind that by default shortcuts
[.lnk files] are restricted by SRP but can be removed from the file list if
needed. Also if having problems configuring rules usually a SRP event is
written to the application log. --- Steve
http://www.microsoft.com/technet/prodtechnol/winxppro/maintain/rstrplcy.mspx
--- XP Software Restriction Policies