Whenever it finishes updating stage it restarts and acts like nothing ever installed, this has happened 4 times already and my system drive is already 40Gb fun, win7 is NOT 40Gb
Is this a windows update? Fresh install of Windows?
If its a windows update, unplug or disconnect from the internet after rebooting and then see what is going on because of the Windows Update.
If its during a clean install, the media you're using may be damaged causing it to read incorrectly or the BIOS may be set to boot to the CD first or automatically making it seem like its a never ending loop