Originally Posted by BacteriumFendYoke
This cannot be fixed in XP and is an integral part of the system.
Nonsense. Open user manager, add a user, do not put them in the administrators group. If you omit them from the "power users" group, they won't even be able to edit the registry. To install things you can either use "run as" or simply log out the low level user and log in as admin. I run dozens of networks, hundreds of PCs, about half still XP and almost never do I allow users to run with any sort of "root" access, which is really more of a *nix term. The macs I have to manage are actually a bit of an issue, because unlike Windows, the tools to manage large groups of users and computers for macs are the pits.
This isn't to say that folks shouldn't upgrade to 7 or 8, though. Both are more secure in other ways, and MS doesn't want to keep fixing XP holes.