I installed ubuntu with wubi in windows7 64bit, and I had installed Mandriva 2011 with a disk. I tried to learn linux with Ubuntu and misused mke2fs; after I reboot my computer, windows7 and ubuntu has crashed. As I have mandriva, I boot into mandriva and found
# df -h
/dev/sda7 12G...
boot issues
boot loader
command line
disk management
dual boot
error 13
file recovery
file system
grub
installation
linux
linux filesystem
mandriva
mke2fs
partitioning
ubuntuubunturecovery
windows 7
wubi