If you have any other VNC servers installed, please uninstall them now.

Download the TightVNC-Jaadu server. (source code)

Run the TightVNC installer and click Next to progress through the following setup windows: Information, Select Destination Location, Select Components, and Select Start Menu Folder. Leave the default options selected for these windows.
See this step

The options to select for the Select Additional Tasks setup window will depend on the version of Windows you are using.

If you are using Windows XP, check all of the option boxes then click Next.
See this step

If you are using Windows Vista, un-check all of the option boxes then click Next.
See this step

Read over the options you’ve selected and click Install. Depending on the specifics of your system, several different things may happen next.

If you are prompted to restart your computer, click Finish to restart and return to this step once your computer has restarted. If you do not see this message, please continue.

If this is the first time TightVNC has been installed on your machine, you may be prompted to enter a default password automatically at the end of your TightVNC installation.

If you do not see this message, you will have to manually launch TightVNC to enter a password. If the TightVNC V icon appears in your taskbar, double-click it to launch TightVNC.

If the TightVNC V icon does not appear in your taskbar, from the Start Menu click All Programs > TightVNC > Launch TightVNC Server to launch TightVNC.

Enter a secure password in the Primary password box that is 8 characters or less. Make a note of your password as you will need it when setting up iTeleport on your iPhone in Step 3.3. Leave this window open and continue to the next step.

Related: Choosing a secure password

Double-click the TightVNC V taskbar icon to open the TightVNC Server Properties window if it is not already open from the previous step. Click the Hooks tab. Check the Poll full screen option and click OK.

Download and install DFMirage. This is a driver that can improve screen response time when using iTeleport. This step is optional for Windows XP users and recommended for Windows Vista users, as some Vista installations will not function without it.