1. If you are doing more Windows 7 installs, create DVD that contains SP 1 by procedure named slipstreaming.
2. Service pack 1 does not contain Internet Explorer 9 (see Updates in Win7 and WS08R2 SP1.xls). You should update previous version (IE8) and when all updates are installed you can install Internet Explorer 9. If you think that IE9 makes problem, uninstall
it, do all necessary update and install IE9 again.