First check if the program is the Windows Vista Magnifier: if that's the case, go to All Programs - >Accessories ->Ease of Access -> Ease of Access Center, click the blue link titled Make computer easier to see, uncheck the "Turn on Magnifier"
option, click Apply and then exit; restart computer and make sure that magnifier does not start upon startup.
If it is another program, download and run Sysinternals Autorun (http://technet.microsoft.com/en-us/sysinternals/bb963902) to find the startup location of the program and disable it.
Bye.
Luigi Bruno - Microsoft Community Contributor 2011 Award