1. I'm going to assume (going out on a limb...) there are two separate problems:
o windows\system32\netsetup\cpl
o Windows Update
2.
Windows XP (Edition and Service Pack Level). Home Edition or Professional? Original, Service Pack1 (SP1), SP2, or SP3?
To find out:
Left click on "Start"; hunt for "My Computer"
- it's somewhere close; right click on "My Computer"; left click on "General" tab. Should be listed on that tab window somewhere.
3.
windows\system32\netsetup\cpl.
If Windows XP SP2, then see
here for 'You receive an "Error occurred while Windows was working with the Control Panel file" error message when you open Control Panel in Windows XP SP2'.
4.
Windows Update Failure. Is it possible your system is configured to automatically download but not install the updates? See
How to configure and use Automatic Updates in Windows XP.
Or the user friendly version:
Automatic Update for Windows XP5.
Remove Downloaded Updates. This is uncharted territory for me, so you probably should do some reading or get some confirmation that this is what you want to do before you start operating on your system. A working system is probably better than a broken one.
How to delete downloaded but uninstalled update.can't stop an update download, please help