start>settings>taskbar and start menu>advanced>add - then browse to your ie7 program which should be c:\program files\internet explorer\iexplore.exe - click on NEXT then browse to STARTUP and click NEXT then click FINISH
Click on your Internet Explorer icon but dont let go.
Drag to the the Start button then over Programs and then Startup. Let go to the right of StartUp and you have now placed a shortcut to Internet Explorer which will start every time you start your PC.