How to secure computers ???

One way is to go into the registry of each computer to be secured and edit those properties of the system you are experiencing problems with. The link below (and the links attached to them), will provide a great deal of information that does work.

http://www.jsiinc.com/SUBA/tip0000/rh0050.htm

Remove any spaces embedded in the above link.

Hi,

You can also secure the IE browser settings using a configuration script which is created with the IEAK (IE Administration Kit)

One of the first things often changed is to disable changing or removal of that script.

The IEAK is a much friendlier interface than hacking around with registry settings and the good point is that you can alter everyone's configuration simply in one place (ie. The script)

You keep the script in a secure place on a server and have everyone's PCs point to it.

The bad point is that you cant control other settings (like the desktop and start menus) from Anna777's response above.

Personally, I'd be controlling these settings through the use of "Group policies" and "Computer policies" rather than registry hacks.

Again that's all controlled centrally and changes are far easier than Anna's solution.

Changing all these configurations need to be carefully considered, however, and I suggest you get a reference book and what to do and why. Its way too indepth to get into here...

Hope it goes well, though,
Cheers,
Tim.

Use policy editor (poledit.exe) to create policy files (saved to the netlogon share of your PDC) These are the applied at each logon you can allow one off changes or you can restrict any changes. They can be applied Globally, to Groups, to individual users or computers(NETBIOS Names). The use of policies is far too complex to discuss in detail here but most admin guides etc will have a section dedicated to them.
Registry hacks are useful for one-off settings but not good for network management just think how you would keep track of the changes you make to any more than 4\5 machines.

Chris