Installed Ubuntu next to Windows but can't find Windows

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http://askubuntu.com – I just installed Ubuntu onto my hard drive from a USB drive. When I reached the partitions screen, I noticed it listed the full hard drive as "free space" even though I already had Windows 7 installed. I knew I had about 50 GB of free space on the hard drive, so I partitioned sda1 for 35 GB and installed Ubuntu onto it, and partitioned sda2 for 4 GB of swap space. The installation went fine, but when I reach the GRUB boot menu, there is no option for Windows 7 -- only Ubuntu. It seems as though my Windows 7 installation has completely disappeared. This would be very unfortunate, as I had a (HowTos)