How to change Windows machine IP without being an admin?

I've always had success with the "Offline NT password & Registry Editor" found here

No Linux experience required, just follow the instructions to get it onto a CD / USB stick, and go through the prompts (mostly just using the defaults) to re-enable the disabled Admin account and then reset its password.

You could try to boot some linux distro (i.e. PartedMagic or Ubuntu Live) and use a tool to reset/unlock/remove password of the local Administrator user account. Then you would be able to login to the local user with blank password by typing .\Admisistrator into the username box.

Please see: How-To Geek

NOTE: Only do this if you are familar with Linux, because using this method you could easily broke your Windows OS!

I don't think this is possible without an admin account, reinstalling the OS, or using a live CD of some sort to manually modify the windows config files. However, hope is not lost, since you may be able to boot into the administrator account with some password-bypassing tools like KON-BOOT.

Note0: this method requires you to connect a USB stick to the computer, which may not be allowed by the policy of some organization, in which case - it cannot be used.

Note1: this may require some tweaking of the BIOS in certain cases, so if it is password protected - you'll have to find a way to bypass that too.

Note2: obviously, if you do choose this path, make sure you trust the person who has physical access to the machine, and that he does not mean to use this method to do things he's not supposed to (seeing how he will now have admin access to the machine, if this process works).

Just had another idea:

In the spirit of LiveCD - you could instruct them to take out the harddrive of this machine and connect it to a functional machine (preferrably with network access), giving you, the admin, access to files on the harddrive and possibly allowing you to change the windows configurations.

If you have access to the harddrive, you might be able to modify the hosts file to redirect the wrong IP to wherever you need, or replace\edit the relevant Windows configuration files.