If your running Windows XP Professional, I reccomend using "Remote Desktop" - its included. In my testing, there is nothing faster then it.
FYI, it uses TCP port 3389, that may be useful for ya ;-).

For more information, search for "remote desktop" in XP's Help and Support.

Like i mentioned before i want to be able to use HTTP tunneling (port 80 Cloaking). Also i want the user to still be in control as well and i don't want to have to play around with the firewall settings at all.

I have not used this myself, but I hear good things about VNC (Virtual Network Computing), especially the version called TightVNC, which has some enhancements. There are other versions, as well.

Hope this helps!

VNC can do what you're asking...but the session is not encrypted and you'd have to do some footwork to get it working on port 80. It is possible to encrypt the session...I use SSH for this.

VNC info:

http://www.realvnc.com/documentation.html

Setting up VNC on common ports:

http://www.calwell.ca/articles/a0028.php

You're going to have to do some firewall trickery to get this to work correctly, unless you change the ports for VNC/RD.

It's all open session/authentication as well, so you'll probably want to use SSH.

But will VNC allow me to remotely install the server over this open "common" port? I need to be able to install the server side of the application w/o the users intervention.

real vnc is about 250Kb and has a very simple setup.
if its just that your users maybe a little slow on the uptake (i know mine are) then you should be able to email the program and a text file to tell them what to do.
if your looking to do this without them knowing (dont want to be a kill joy and point out the legality of this) then you may want to have a look around the hacker sites, if you just want to install automaticaly (with there permission) then you may still find something of use on the hacker sites. eg Bo2k, cane and able etc

Yeah but all the tools that they use, i already looked and checked around, come up as a virus, and i can't have that happening. Thanks for the input though. If you got any other suggestions please run them by.