I had an XP partition set as my boot partition, set to the left of my Windows 7 partition. I deleted the XP partition and expanded the 7 partition to the left. I tried to restore the MBR using
ms-sys -m /dev/sda. After that didn't work I tried the same thing, except with
-w instead of
-m. Now, the Ubuntu Live CD shows the partition as an unknown filesystem.
I've tried the following: