This is what I get from several source about running iTalc in Vista/7.

http://www.edugeek.net/forums/network-classroom-management/9570-italc-compatibility-windows-vista.html

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This setup is for Windows Vista Clients ONLY! I have no idea if it will work with VISTA as a Master. I use Windows XP as the Master in my setup.

There is not an easy install for Vista Clients (yet anyway). You will have to visit each system (be sure to write down host names as you go, it will make things much easier).

Let’s get started.

This guide assumes that you have successfully setup a Master PC. This guide also assumes that your setup files reside on USB Drive F:\iTalc and that your public key also resides on USB Drive F:\iTalc

1.) Log into Vista PC with admin rights.
1b.) Disable Vista Aero Theme (if applicable)
2.) Insert USB Drive into Vista PC Navigate to your F:\iTalc
3.) Set Setup.exe to Windows XP SP2 Compatibility Mode
4.) Run Setup.exe and when prompted, choose F:\iTalc for the location of your Public key.
5.) After Setup has completed, open Task Manager and stop the ica.exe process.
6.) Run services.msc and stop the iTalc service. Also set the service to only run manually.
7.) Goto your local iTalc install folder (C:\Program Files\iTalc) and set ica.exe to Windows XP SP2 Compatibility Mode.
8.) Create a Shortcut to ica.exe and copy/move it to your Startup Folder.
9.) Run ica.exe

This completes the Vista Workstation install. You can now add the system from the Master interface using the hostname. Below are some issues I have noticed with this setup.

Issues:
1.) If more than one user is logged into a machine, iTalc will not work.
2.) The client system cannot be accessed unless a user is logged in (also remote login does not work as the ica.exe is not running until a user logs in).
3.) The master does not recognize when a Vista System is in screen saver mode (shows last desktop prior to screensaver, it does come back once the system wakes up).
4.) The thumbnail screen will flash between a black screen and the actual desktop 4-5 times before finally connecting. This is only on the initial start of the master/client program.

All in all, it is highly functional. There are some nice features that I miss (remote login/logoff being the primary) but you cannot beat free.
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And if you think all those commands in linux are difficult, try silently deploying
iTalc in a network of Windows (especialy windows 7) computers.
Oh well, a few more gray hairs, but we did get it to work in our school.