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.