Posted 16 August 2010 - 11:07 AM
You basically have 2 options.
1. Use your Ubuntu live cd, boot into that and restore Grub. That will get you back to were you started from. I can give you instructions on how to re-install Grub if that is the route you want to go.
2. Use your Windows 7 cd, boot into that and select Startup Repair, that will re-install Windows Master Boot Record, and you will be able to boot up into Windows, but Windows won't be able to see you Linux partition.