When you start Internet Explorer 7, it immediately quits.
This behavior will occur if the IEProxy.dll library is incorrectly registered.
To workaround this problem:
1. Close all instances of Internet Explorer 7 that may be running.
2. Open a CMD.EXE window.
3. Type the following commands, pressing Enter after each line:
cd "%programfiles%\Internet Explorer"
regsvr32 /s IEProxy.dll
4. Start Internet Explorer 7.