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Here’s how to install and start up an UltraVNC server from within an RDP session. This has been tested with UltraVNC 1.0.8 and a remote desktop session into a Windows XP Professional SP3 installation, but should work in other Windows / UltraVNC combinations as well.

1. RDP into the target system, and install UltraVNC. Be sure to select the checkboxes for registering VNC as a service, and starting up the service at boot time.
2. Set a VNC password for the currently logged in user by starting up the VNC server (Start > All Programs > UltraVNC > UltraVNC Server > Start UltraVNC Service), then entering a password when prompted
3. Open up Regedit (Start > Run > regedit)
4. Copy the HKEY_CURRENT_USER\Software\ORL\WinVNC3\Password entry’s current value
5. Create a new binary value entry located at “HKEY_LOCAL_MACHINE\SOFTWARE\ORL\WinVNC3\Default\Password”. Paste in the value you copied in the previous step to this new entry’s value
6. Reboot

That’s it! It may be possible to get VNC going without the reboot, but this is the combination that got a working installation going for me.

Windows XP Professional offers a Remember my password checkbox when mapping to a network drive, or other password protected network resource.
Unfortunately, once you’ve set a password, the Remember my password box disappears, so future username or password changes can result in repeated password prompts. Here’s how to clear your previously set username and password, and get the Remember my password checkbox back:

1. Click Start -> Run
2. Type in control userpasswords2, and press Enter
3. Click on the Advanced tab
4. Click the Manage Passwords button
5. Select the server for which you wish to delete existing settings, then click the Remove button
6. Click Close
7. Click OK
8. Logout of Windows XP, then back in
9. Connect to the password protected server. You should now be prompted for your username and password, along with the previously missing Remember my password checkbox

The above may work in other version of Windows, but I haven’t tested this out. Please post a comment if you’ve been able to use this procedure to get the Remember my password box back under your Windows version!